Question

two pool balls, each moving at 2 m/s, roll toward each other and collide. suppose after bouncing apart, each moves at 2 m/s. assume the positive direction is to the right. this collision violates conservation of a. kinetic energy b. momentum c. both kinetic and momentum d. none of the above

Answer 1

Answer:

(D)  From what has been given

For a linear elastic collision the speed of separation equals the speed of approach - if the relative speed of approach  was 4 m/s, the relative speed of separation will be 4 m/s - both KE and momentum are considered conserved