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

If impulse/ varies with time t as f (kg ms^(-1))=20t^(2)-40t.The chang

1.	If impulse/ varies with time t as f (kg ms^(-1))=20t^(2)-40t.The change in momentum is minimum at
Answer» t=2s t=1s `t=(1)/(2)s` `t=(3)/(2)s` SOLUTION :(b) Impulse is defined as rate of change of momentum. For change in momentum to be minimum `(d)/(dt) ( 20t^(2)-400t)=0` 40t-40=0 t=1s