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A small block of mass M moves on a fric...

A small block of mass `M` moves on a frictionless surface of an inclined plane, as shown in the figure. The angle of the incline suddenly changes from `60^(@)` to `30^(@)` at point `B`. The block is many at rest at `A`. Assume that collisions between the block id the incline are totally inelastic.
If collision between the block and the incline is completely elastic, then the vertical (upward) component of the velocity of the blocks at point `B`, immediately after it strikes the second incline is

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A small block of mass M moves on a frictionless surface of an inclined plane, as shown in the figure. The angle of the incline suddenly changes from 60^(@) to 30^(@) at point B . The block is many at rest at A . Assume that collisions between the block id the incline are totally inelastic. The speed of the block at point B immediately after it strikes the second incline is

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A small block of mass M moves on a frictionless surface of an inclined plane, as shown in the figure. The angle of the incline suddenly changes from 60^(@) to 30^(@) at point B . The block is many at rest at A . Assume that collisions between the block id the incline are totally inelastic. The speed of the block at point C , immediately before it leaves the second incline