1.

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`

Answer» Correct Answer - B
Impulse is defined as rate of change of momentum. For change in momentum to be minimum
`d/(dt)(20 t^(2) -40 t)=0`
`40 t-40=0`
`t=1 s`


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