on the roller skating rink, a 68 kg girl was moving at 17 m/s when she collided

Question

on the roller skating rink, a 68 kg girl was moving at 17 m/s when she collided with a 76 kg girl who was moving forward at 12 m/s and directly in her path. the first girl jumped onto the back of the other and the two continued moving forward together. determine their speed immediately after the collision
A. 12 m/s B. 5 m/s C. 29 m/s D. 15 m/s E. 14 m/s F. 17 m/s on the roller skating rink, a 68 kg girl was moving at 17 m/s when she collided with a 76 kg girl who was moving forward at 12 m/s and directly in her path. the first girl jumped onto the back of the other and the two continued moving forward together. determine their speed immediately after the collision
A. 12 m/s B. 5 m/s C. 29 m/s D. 15 m/s E. 14 m/s F. 17 m/s
A. 12 m/s B. 5 m/s C. 29 m/s D. 15 m/s E. 14 m/s F. 17 m/s

Explanation / Answer

Use conservation of momentum:

pi = pf

=> (68*17) + (76*12) = (68+76)v

=> v = 14 m/s (option E)

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