1.

A body of mass m is projected with initial speed u at an angle with the horizontal. The change in momentum of body after time t is(1) mu sine(2) 2musino(3) mgt(4) Zero​

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mgtExplanation:ASSUME the ANGLE to be θat initial point that is at lowest point 'u' will have two components one is usinθ(vertical) and other one is ucosθ (HORIZONTAL)at any instant i.e 't' vertical component will be= usinθ-gt and horizontal componenet will remain unchanged =ucosθ (as there is no acceleration in that direction)initial linear P = musinθj+mucosθifinal P(at any instant)=mucosθ+mu(sinθ-gt)jΔP=final P - initial P hence we'll get -mgtjIΔPI=mgt



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