A ball of mass m is released from the top of an inclined plane of angle ø. Its strikes a rigid wall at a distance 3l/4 from top elastically. The impulse imparted to ball by rigid wall is
(1) m√3/2gh
(2)m√3gh
(3)2m√3gh
(4)m√6gh
(l= length of hypotenuse of plank)
(h = height of inclined plane)
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