Center of MassHard

Question

A ball of mass m strikes the fixed inclined plane after falling through a height h. If it rebounds elastically, the impulse on the ball is :    
               

Options

A.2 m cos θ
B.2 m cos θ
C.
D.2 m

Solution


Here  e = 1
if ball rebound elastically
vLOI = uLOI
∴ Along line of impact momentum conservation 
= mv − (−mu) = mv + mu = 2mu
Alog LO I uLOL = u cosθ =
J = 2m cosθ..

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