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Read the given passage and answer the fo...

Read the given passage and answer the following questions.
A small block of mass M = 1 kg 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 Q. The block is initially at rest at point P. Assume that there is no loss of energy for collisions between the block and the incline. (Take `"g = 10 m s"^(-2)`)

The speed of the block at point Q immediately before it strikes the second incline is

A

`sqrt60 m s^(-1)`

B

`sqrt45 m s^(-1)`

C

`sqrt30 m s^(-1)`

D

`sqrt15 m s^(-1)`

Text Solution

Verified by Experts

The correct Answer is:
A
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