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An object of m kg with speed of v m/s strikes a wall at an angle θ and rebounds at the same speed and same angle. The magnitude of the change in momentum of the object will be

a
2mv cosθ
b
2mv sinθ
c
0
d
2mv

detailed solution

Correct option is A

P→1 =  mv sinθi^−mvcosθj^   and  P2→ = mvsinθi^+mvcosθj^So change in momentumΔP→  =  P2→ −P1→ = 2 mv cosθj^,   |ΔP→|  =  2mv cosθ

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Statement I : The familiar equation mg = R for a body on a table is true only if the body is in equilibrium.

Statement II : The equality of mg and R has no connection with the third law.


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