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A small block of mass M moves on frictionless surface of an inclined plane, as shown in figure. The angle of the incline suddenly changes from $$60^\circ$$ to $$30^\circ$$ at point B.
The block is initially at rest at A. Assume that collisions between the block and the incline are totally inelastic (g = 10 m/s$$^2$$)
The speed of the block at point B immediately after it strikes the second incline is
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