Physics-
General
Easy
Question
If the velocity 
of a particle moving along a straight line decreases linearly with its displacement s from 20 m/s to a value approaching zero at s=30 m, then acceleration of the particle at s=15m is
The correct answer is:
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There are two incline planes AO and OB inclined at 45° and 60° respectively with the horizontal as shown in the figure. When a man moves on the incline plane AO with speed 10 m/s, he observes that the rain drops are falling 45° with the vertical. When the man moves on the inclined plane OB with speed 20 m/s, he observes that the raindrops are falling vertically downward. Then actual speed of rain is
There are two incline planes AO and OB inclined at 45° and 60° respectively with the horizontal as shown in the figure. When a man moves on the incline plane AO with speed 10 m/s, he observes that the rain drops are falling 45° with the vertical. When the man moves on the inclined plane OB with speed 20 m/s, he observes that the raindrops are falling vertically downward. Then actual speed of rain is
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From a point A on bank of a channel with still water a person must get to a point B on the opposite bank. All the distances are shown in fig. The person uses a boat to travel across the channel and then walks along the bank to point B. The velocity of the boat is 
and the velocity of the walking person is 
. Then,
From a point A on bank of a channel with still water a person must get to a point B on the opposite bank. All the distances are shown in fig. The person uses a boat to travel across the channel and then walks along the bank to point B. The velocity of the boat is and the velocity of the walking person is . Then,
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A man crosses a river from point A. If he swims perpendicular to the bank, he reaches point C, 10 minutes later. If he swims at an angle 
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A boy throws a ball upwards with velocity 
The wind imparts a horizontal acceleration of 
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A boy throws a ball upwards with velocity The wind imparts a horizontal acceleration of to the left. The angle at which the ball must be thrown so that the ball returns to the boy's hand is
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The acceleration of a train between two stations 2 km apart is shown in the figure. The maximum speed of the train is:
The acceleration of a train between two stations 2 km apart is shown in the figure. The maximum speed of the train is:
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A body is moving in a straight line as shown in velocity-time graph. The displacement and distance travelled by body in 8 s are respectively :
A body is moving in a straight line as shown in velocity-time graph. The displacement and distance travelled by body in 8 s are respectively :
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A cockroach moves rectilinearly such that, after sometime 
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graph as shown in the figure for the motion of the cockrach, find the average velocity of the cockroach over the time 
.
A cockroach moves rectilinearly such that, after sometime let its (instantaneous) velocity be equal to its average velocity over that time. Referring to the graph as shown in the figure for the motion of the cockrach, find the average velocity of the cockroach over the time .
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A boy begins to walk eastward along a street in front of his house and the graph of his position from home is shown in the following figure. His average speed for the whole time interval is equal to
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The acceleration - time graph of a particle moving along a straight line is shown. After what time the particle attains its initial velocity ?
The acceleration - time graph of a particle moving along a straight line is shown. After what time the particle attains its initial velocity ?
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Starting from rest at S=0, a boat travels in a straight line with an acceleration as shown by the a-s graph. The boat speed at s=40,90 and 200 m is
Starting from rest at S=0, a boat travels in a straight line with an acceleration as shown by the a-s graph. The boat speed at s=40,90 and 200 m is
physics-General
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The figure shows the displacement-time 
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The figure shows the displacement-time graph of a body moving in a straight line. Which one of the graphs shown. represents the velocity-time graph of the motion of the body.
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Two particles are thrown from the same point in the same vertical plane, as shown in figure simultaneously. Then indicate the correct statements :
Two particles are thrown from the same point in the same vertical plane, as shown in figure simultaneously. Then indicate the correct statements :
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Two particles are projected from A and C simultaneously towards each other and they collide in air. 
and 
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, 
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Find
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A ball is projected from a point A with some velocity at an angle 30° with the horizontal as shown in the figure. Consider a target point B. The ball will hit the target if it is thrown with a velocity 
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A projectile is fired with a velocity u at right angles to the slope, which is inclined at an angle q with the horizontal. The expression for the distance R to the point of impact is
A projectile is fired with a velocity u at right angles to the slope, which is inclined at an angle q with the horizontal. The expression for the distance R to the point of impact is
physics-General
