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If impulse I varies time t as I(kg ms^(-...

If impulse I varies time t as I`(kg ms^(-1))=20t^(2)-40t`.
The change in momentum is minimum at :-

A

t=2 s

B

t=1 s

C

`t=(1)/(2)s`

D

`t=(3)/(2)s`

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The correct Answer is:
B
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