science
Grade-7
Easy
Question
What is the acceleration of a truck which starts from rest, and after 5 s its velocity is 20 m/s? What is the direction of the acceleration of the truck?
- 5 m/s, along the velocity
- 4 m/s, along the velocity
- 5 m/s, opposite to the velocity
- 4 m/s, opposite to the velocity
Hint:
Final velocity = initial velocity + acceleration 
time.
The correct answer is: 4 m/s, along the velocity
Given:
Initial velocity (u) = 0ms-1
Final velocity (v) = 20ms-1
time taken (t) = 5s
Acceleration (a) = ?
Formula:
v = u + at
Solution:
ANSWER:
As the acceleration is positive which means the direction of acceleration is same as of the velocity.
Related Questions to study
science
Acceleration is a _____ quantity, as it has ____.
In positive acceleration its magnitude will be positive and direction is same as of the velocity.
In negative acceleration its magnitude will be negative and direction is opposite as of the velocity.
Acceleration is a _____ quantity, as it has ____.
scienceGrade-7
In positive acceleration its magnitude will be positive and direction is same as of the velocity.
In negative acceleration its magnitude will be negative and direction is opposite as of the velocity.
science
A car moves at a speed of 5 m/s throughout its journey. What is its acceleration?
the car is not speeding up or slowing down.
A car moves at a speed of 5 m/s throughout its journey. What is its acceleration?
scienceGrade-7
the car is not speeding up or slowing down.
science
A car moving at a velocity of 6.5 m/s increases its velocity uniformly to 78 m/s in 10 s. Work out its acceleration with a proper sign.
Positive acceleration means the direction of acceleration is same as of the direction of velocity.
A car moving at a velocity of 6.5 m/s increases its velocity uniformly to 78 m/s in 10 s. Work out its acceleration with a proper sign.
scienceGrade-7
Positive acceleration means the direction of acceleration is same as of the direction of velocity.
science
Pick the odd one out.
Pick the odd one out.
scienceGrade-7
science
The following table shows the velocity of a moving car at different timestamps. The car is undergoing ___.
| Timestamp |
Velocity in m/s |
| 11:00 |
34 |
| 11:05 |
32 |
| 11:10 |
27 |
| 11:15 |
18 |
| 11:20 |
24 |
| 11:25 |
43 |
| 11:30 |
49 |
Acceleration is the rate of change of velocity.
The following table shows the velocity of a moving car at different timestamps. The car is undergoing ___.
| Timestamp |
Velocity in m/s |
| 11:00 |
34 |
| 11:05 |
32 |
| 11:10 |
27 |
| 11:15 |
18 |
| 11:20 |
24 |
| 11:25 |
43 |
| 11:30 |
49 |
scienceGrade-7
Acceleration is the rate of change of velocity.
science
Which of the following is/are true for a freefall?
a. It is a uniform motion in which an object falls towards the center of the earth.
b. It is an accelerated, non-uniform motion in which an object falls towards the center of the earth.
c. It is a uniformly accelerated motion.
d. The acceleration due to gravity is 9.8 m/s2.
Which of the following is/are true for a freefall?
a. It is a uniform motion in which an object falls towards the center of the earth.
b. It is an accelerated, non-uniform motion in which an object falls towards the center of the earth.
c. It is a uniformly accelerated motion.
d. The acceleration due to gravity is 9.8 m/s2.
scienceGrade-7
science
Which of the following remains constant in a uniform circular motion?
Which of the following remains constant in a uniform circular motion?
scienceGrade-7
science
Which of the following is/are true for a uniform circular motion?
a. It is an accelerated motion.
b. The speed of the body keeps on constantly changing throughout the motion.
c. The velocity of the body keeps constantly changing throughout the motion.
d. The acceleration of the body is directed along with the velocity at all points of motion.
Which of the following is/are true for a uniform circular motion?
a. It is an accelerated motion.
b. The speed of the body keeps on constantly changing throughout the motion.
c. The velocity of the body keeps constantly changing throughout the motion.
d. The acceleration of the body is directed along with the velocity at all points of motion.
scienceGrade-7
science
What is the direction of positive acceleration w.r.t. the velocity of a moving body?
What is the direction of positive acceleration w.r.t. the velocity of a moving body?
scienceGrade-7
science
A moving body is said to be decelerating if it is ____.
A moving body is said to be decelerating if it is ____.
scienceGrade-7
science
A moving body is said to be positively accelerating if it is ____.
Example : when person jumps off the height.
A moving body is said to be positively accelerating if it is ____.
scienceGrade-7
Example : when person jumps off the height.
science
Which of the following remains constant during freefall?
Which of the following remains constant during freefall?
scienceGrade-7
science
Uniform circular motion is a/an ___ motion.
Uniform circular motion is a/an ___ motion.
scienceGrade-7
science
The SI unit of acceleration is ___.
The SI unit of acceleration is ___.
scienceGrade-7
science
The rate of change of ___ is called acceleration.
The rate of change of ___ is called acceleration.
scienceGrade-7
