Question

Two pucks of equal mass collide. One puck (puck A) is stationary before the collision. After the collision the puck that was initially stationary moves along in the same direction in which the puck that hit it (puck B) was initially moving. Which of the following statements is correct if the total energy of the system is conserved during the collision (elastic collision)?

A. The puck B rebounds.

B. There isn’t enough information to answer the question.

C. Both pucks slide past the point of collision.

D. The puck B remains at the point of collision.

Answer 1

Answer:D

Explanation:

Given

initial velocity of puck A is $u_a=0$

initial velocity of Puck B is $u_b$

After collision Puck A started moving in the direction of B and collision is elastic so Puck B remains at the point of collision and Puck A moves with initial velocity of B.

Answer 2

Answer:

The answer is: D. The puck B remains at the point of collision.

Explanation:

Please look at the solution in the attached Word file.