if momentum decreases by 20% k. e. will decrease by?
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if momentum decreases by 20% k. e. will decrease by?
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Momentum decreases by 20%
So p' = 0.8p
KE' = p'^2/2m
KE' = (0.8p)^2/2m
KE' = 0.64 p^2/2m
KE' = 0.64 KE
Decrease in KE = (1-0.64)KE = 0.36
% decrease in KE = 36%
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