Physics-
General
Easy
Question
An express train is moving with a velocity 
. Its driver finds another train is moving on the same track in the same direction with velocity 
. To escape collision, driver applies a retardation 
on the train. The minimum time of escaping collision will be
- None
- Both
The correct answer is:
As the train are moving in the same direction. So the initial relative speed 
and by applying retardation final relative speed becomes zero
From 
Related Questions to study
Physics-
A particle moves for 20 s with velocity 
and then moves with velocity 
for another 20 s and finally moves with velocity 
for next 20 s. What is the average velocity of the particle?
A particle moves for 20 s with velocity and then moves with velocity for another 20 s and finally moves with velocity for next 20 s. What is the average velocity of the particle?
Physics-General
Physics-
From the top of a tower, a particle is thrown vertically downwards with a velocity of 
. The ratio of the distances, covered by it in the 3rd and 2nd seconds of the motion is (Take 
)
From the top of a tower, a particle is thrown vertically downwards with a velocity of . The ratio of the distances, covered by it in the 3rd and 2nd seconds of the motion is (Take )
Physics-General
Physics-
The time taken by a block of wood (initially at rest)to slide down a smooth inclined plane 
long (angle of inclination is 
) is
The time taken by a block of wood (initially at rest)to slide down a smooth inclined plane long (angle of inclination is ) isPhysics-General
Physics-General
Physics-
A ball is dropped on the floor from a height of 
. It rebounds to a height of 
. If the ball is in contact with the floor for 
sec, the average acceleration during contact is
A ball is dropped on the floor from a height of . It rebounds to a height of . If the ball is in contact with the floor for sec, the average acceleration during contact is
Physics-General
Physics-
The coordinates of a moving particle at any time 
are given by 
The speed of the particle at time is given by
The coordinates of a moving particle at any time are given by The speed of the particle at time is given by
Physics-General
Physics-
Two bodies of different masses are dropped from heights of 16 m and 25 m respectively. The ratio of the time taken by them to reach the ground is
Two bodies of different masses are dropped from heights of 16 m and 25 m respectively. The ratio of the time taken by them to reach the ground is
Physics-General
Physics-
A particle starts from rest. Its acceleration 
versus time 
is as shown in the figure. The maximum speed of the particle will be
A particle starts from rest. Its acceleration versus time is as shown in the figure. The maximum speed of the particle will bePhysics-General
Physics-General
Physics-
If a body starts from rest and travels 
in the 6th second, then what is the acceleration
If a body starts from rest and travels in the 6th second, then what is the acceleration
Physics-General
Physics-
A body is falling freely under gravity. The distances covered by the body in first, second and third minute of its motion are in the ratio
A body is falling freely under gravity. The distances covered by the body in first, second and third minute of its motion are in the ratio
Physics-General
Physics-
A body, thrown upwards with some velocity, reaches the maximum height of 
Another body with double the mass thrown up, with double initial velocity will reach a maximum height of
A body, thrown upwards with some velocity, reaches the maximum height of Another body with double the mass thrown up, with double initial velocity will reach a maximum height of
Physics-General
Physics-
graph for a particle is as shown. The distance travelled in the first 
is
graph for a particle is as shown. The distance travelled in the first isPhysics-General
Physics-General
Physics-
A body of 
is moving with a velocity of 
. If a force of 
is applied on it for 
in the same direction as its velocity, what will now be the velocity of the body
A body of is moving with a velocity of . If a force of is applied on it for in the same direction as its velocity, what will now be the velocity of the body
Physics-General
Physics-
A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
A body is thrown vertically upwards. If air resistance is to be taken into account, then the time during which the body rises is
Physics-General
Physics-
A body is travelling in a straight line with a uniformly increasing speed. Which one of the plot represents the change in distance 
travelled with time 
A body is travelling in a straight line with a uniformly increasing speed. Which one of the plot represents the change in distance travelled with time
Physics-General
Physics-
From the top of a tower two stones, whose masses are in the ratio 
are thrown one straight up with an initial speed 
and the second straight down with the same speed . Then, neglecting air resistance
From the top of a tower two stones, whose masses are in the ratio are thrown one straight up with an initial speed and the second straight down with the same speed . Then, neglecting air resistance
Physics-General
