If impulse I varies time t as I`(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 change in momentum is minimum at

A particle moving in a straight line describes a distance x cm from a fixed point on the line at time at time t s where x=t^(5)-40t^(3)+30t^(2)+180t+240 . Find when the acceleration is minimum and find the minimum value of acceleration.

If displacements of a particle varies with time t as s = 1/t^(2) , then.