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The K.E. of a body decreases by 19%. What is the percentage decrease in momentum ?

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a

20%

b

15%

c

10%

d

5%

answer is C.

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Detailed Solution

Let v and y be the initial and final velocities of the body. Then12mv'212mv2=81100 ∴ v'v=910 or mV'mV=90100=90% So, the decrease in momentum is 10%.

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