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Q.

A small block of mass m is pushed towards a movable wedge of mass m and height h with initial velocity u. All surfaces are smooth. The minimum value of u for which the block will reach the top of the wedge

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a

gh

b

None of these 

c

2gh

d

2gh

answer is C.

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Detailed Solution

P sys = const

mu = 2 mv0 ... (i)

M.E conserved 

12mu2 = mgh +212mv02 12mu2 = mgh + mu24 14mu2 = mgh  u = 2gh

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A small block of mass m is pushed towards a movable wedge of mass m and height h with initial velocity u. All surfaces are smooth. The minimum value of u for which the block will reach the top of the wedge