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Classical Mechanics

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Kinetic Energy Lost During a Collision

CLMECH-BQBTAS

Created for Albert.io. Copyright 2016. All rights reserved.

A $950\text{ kg}$ electric car moving to the right at $26\text{ mi/hr}$ ($12\text{ m/s}$) collides head on with a $2100\text{ kg}$ sedan moving to the left at $26\text{ mi/hr}$. During the collision, their bumpers tangle and they move together to the left at $9\text{ mi/hr}$ ($4.0\text{ m/s}$) before sliding to a stop.

How much kinetic energy does the small car lose during the collision?

A

11%

B

96%

C

110%

D

89%