A Ball Bearing Rolls Along a Smooth Horizontal Tabletop,and Crashes

A ball bearing rolls along a smooth horizontal tabletop,and crashes head-on into a second ball bearing of half its mass.If both ball bearings roll in the x-direction only (either positive or negative) and the initially stationary ball bearing is observed to have a velocity of +2.4 m/s after the collision,what was the initial speed of the first ball bearing?

A) More information is required
B) 7.2 m/s
C) 3.6 m/s
D) 1.8 m/s

Correct Answer:

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