A car of mass 1500 kg is moving with a velocity of 20 m/s. What is its momentum?

A. 30,000 kg·m/s

B. 15,000 kg·m/s

C. 300 kg·m/s

D. 750 kg·m/s

Which of the following best describes the principle of conservation of momentum?

A. Momentum is always conserved in collisions, regardless of external forces.

B. Momentum is conserved only in elastic collisions.

C. The total momentum before a collision is equal to the total momentum after the collision.

D. Momentum is always zero after a collision.

A force of 10 N acts on an object for 2 seconds. What is the impulse imparted to the object?

A. 5 N·s

B. 10 N·s

C. 20 N·s

D. 40 N·s

Which of the following is true about impulse?

A. It is the change in force over time.

B. It is the product of force and time.

C. It is the change in momentum.

D. Both B and C are correct.

A 2 kg ball moving at 5 m/s collides with a stationary 3 kg ball. If the 2 kg ball comes to rest after the collision, what is the velocity of the 3 kg ball?

A. 3.33 m/s

B. 2.5 m/s

C. 1.67 m/s

D. 1 m/s

a) Define momentum and explain how it is related to an object's mass and velocity. [2]

b) A cricket ball of mass 0.15 kg is bowled at a speed of 25 m/s. Calculate its momentum. [2]

a) Describe the principle of conservation of momentum. [2]

b) In a collision, a 2 kg object moving at 3 m/s strikes a stationary 3 kg object. If the 2 kg object comes to rest after the collision, determine the velocity of the 3 kg object. [2]

a) Define impulse and explain its relation to force and time. [2]

b) A force of 20 N acts on an object for 0.5 seconds. Calculate the impulse imparted to the object. [2]

a) Explain the difference between elastic and inelastic collisions in terms of momentum and kinetic energy. [3]

b) Two identical trolleys A and B of mass 0.5 kg each move towards each other on a frictionless surface. Trolley A moves at 2 m/s and trolley B at 3 m/s. After the collision, trolley A moves at 3 m/s in the opposite direction. Calculate the velocity of trolley B after the collision. [3]

c) Is the collision described in part b) elastic or inelastic? Justify your answer. [2]

a) Define the impulse-momentum theorem. [2]

b) A 0.2 kg tennis ball is hit with a racket, causing it to change its velocity from 10 m/s to the left to 15 m/s to the right. Calculate the impulse imparted to the ball. [3]

c) If the contact time between the racket and the ball was 0.04 seconds, determine the average force exerted by the racket on the ball. [3]