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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 energy of the block at point R, immediately before it leaves the second incline is

A

30 J

B

60 J

C

80 J

D

90 J

Text Solution

Verified by Experts

The correct Answer is:
B
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