20 Numerical for Class 9 on Motion:

1. A car moves with a uniform speed of 40 km/h for 2 hours. Calculate the distance covered by the car.
2. A train starts from rest and attains a speed of 50 km/h in 20 seconds. Calculate its acceleration.
3. A ball is thrown vertically upwards with an initial velocity of 15 m/s. Calculate the maximum height reached by the ball.
4. A stone is dropped from a height of 100 m. Calculate the time taken by the stone to reach the ground.
5. A car accelerates uniformly from 20 m/s to 60 m/s in 10 seconds. Calculate its acceleration.
6. A cyclist covers a distance of 20 km in 2 hours. Calculate his average speed.
7. A body is thrown vertically upwards with a velocity of 20 m/s. Calculate the time taken by the body to reach the maximum height.
8. A car covers a distance of 100 km in 2 hours. Calculate its average speed.
9. A body is dropped from rest from a height of 10 m. Calculate its velocity just before it hits the ground.
10. A train takes 10 seconds to come to rest from a speed of 36 km/h. Calculate its retardation.
11. A car moves with a speed of 30 m/s for 20 seconds. Calculate the distance covered by the car.
12. A ball is thrown vertically upwards with an initial velocity of 20 m/s. Calculate the time taken by the ball to reach the maximum height.
13. A stone is thrown vertically upwards with a velocity of 30 m/s. Calculate the time taken by the stone to reach the maximum height.
14. A cyclist covers a distance of 40 km in 4 hours. Calculate his average speed.
15. A body is thrown vertically upwards with a velocity of 20 m/s. Calculate the velocity of the body when it reaches a height of 10 m.
16. A car decelerates uniformly from 60 m/s to 20 m/s in 10 seconds. Calculate its deceleration.
17. A ball is thrown vertically upwards with a velocity of 20 m/s. Calculate the time taken by the ball to reach the ground.
18. A train accelerates uniformly from rest to a speed of 72 km/h in 20 seconds. Calculate its acceleration.
19. A body is dropped from rest from a height of 20 m. Calculate the time taken by the body to reach the ground.
20. A car moves with a speed of 40 km/h for 4 hours. Calculate the distance covered by the car.

Explanation:

These numerical problems on motion are based on the concepts of speed, velocity, acceleration, retardation, distance, and time. The numerical problems can be solved using the formulas of motion. The following concepts are used to solve these numerical problems:

1. Speed: Speed is the rate at which an object covers distance. Speed = Distance/Time
2. Velocity: Velocity is the rate at which an object changes its position. Velocity = Displacement/Time
3. Acceleration: Acceleration is the rate at which an object changes its velocity. Acceleration = (Final Velocity - Initial Velocity)/Time
4. Retardation: Retardation is the rate at which an object decreases its velocity. Retardation

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