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A block is kept on a frictionless inclin...

A block is kept on a frictionless inclined surface with angle of inclination `alpha`. The incline is given an acceleration 'a' to keep the block stationary. Then a is equal to

A

`g tan alpha`

B

g

C

`g cosec alpha`

D

`g//tan alpha`

Text Solution

Verified by Experts

The correct Answer is:
A
Let the mass of a block is m. It will remain stationary if forces acting on it are in equilibrium i.e.,
`m a cos alpha`= pseudo force on block, ,mg = weight
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