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Classical Mechanics

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Kinetic Energy Lost by a Small Car in a Collision

CLMECH-DNNF7S

A small 950 kg car moving to the right 26 mi/hr (12 m/s) collided head on with a 2,100 kg sedan moving left at 26 mi/hr.

During the collision, their bumpers tangled and they moved together to the left at 9.0 mi/hr (4.0 m/s) before sliding to a stop.

What percent of its kinetic energy did the small car lose during the collision?

A

7.6

B

92

C

49

D

90