Asked Dec 13, 2019

A ball with original momentum +4.0 kg⋅m/s hits a wall and bounces straight back without losing any kinetic energy. The change in momentum of the ball is:
a. 0.
b. −4.0 kg⋅m/s.
c. 8.0 kg⋅m/s. d. −8.0 kg⋅m/s.


Expert Answer

Step 1


Momentum of ball = 4.0 kg.m/s

No loss in kinetic energy.

Step 2

Ball hits the wall as shown in figure


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Step 3

Momentum of ball before hitting the wall = ...


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P efor = +4.0 Kg.m/s


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