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

Question

Quizplus · Accepted Answer

The Answer of 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

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