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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44
Answer:
mgt
Explanation:
assume the angle to be θ
at 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+mucosθi
final P(at any instant)=mucosθ+mu(sinθ-gt)j
ΔP=final P - initial P
hence we'll get -mgtj
IΔPI=mgt
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