Class 9 (Science Assignment)

Solve the following numerical problems on force and motion:

1.     A body of mass 10 kg moves with a velocity of 5 m/s. Find its momentum.

2.     A force of 20 N acts on a 4 kg object. Find the acceleration.

3.     A car of mass 1000 kg accelerates at 2 m/s². Find the force applied.

4.     A body changes its velocity from 10 m/s to 30 m/s in 5 s. Find the acceleration.

5.     A ball of mass 2 kg moving at 6 m/s is brought to rest in 3 s. Find the retarding force.

6.     A force of 50 N acts on a body for 5 s. Find the change in momentum.

7.     A body of mass 5 kg moving with velocity 4 m/s collides with a wall and rebounds with velocity 2 m/s in the opposite direction. Find the change in momentum.

8.     A car starting from rest attains a speed of 20 m/s in 4 s. Find its acceleration.

9.     A force of 200 N acts on a body and moves it through 15 m. Find the work done.

10.  A body of mass 8 kg has momentum 40 kg·m/s. Find its velocity.