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.
The speed of the block at point `C`, immediately before it leaves the second incline

`sqrt(120)ms^(-1)`

`sqrt(105)ms^(-1)`

`sqrt(90)ms^(-1)`

`sqrt(75)ms^(-1)`

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