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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Answer:
In motion under gravity the horizontal velocity remain constant so only the change in vertical velocity is to be taken into account.
after time t the vertical velocity is v=usinθ−gt
where usinθ is initial vertical velocity so change in velocity is −gt taking modulus it become gt
so change in momentum will be mass multiplied by gt
so answer is mgt means Option C.
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