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

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 initially at rest at A. Assume that collisions between the block and the incline are totally inelastic

The speed of the block at point B immediately after it strikes the second incline is

A

`sqrt(60) ms^(-1)`

B

`sqrt(45) ms^(-1)`

C

`sqrt(30) ms^(-1)`

D

`sqrt(15) ms^(-1)`

Text Solution

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The correct Answer is:
B
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