Question

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​

Answer 1

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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