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The time taken by a block of wood (initi...

The time taken by a block of wood (initially at rest) to slide down a smooth inclined plane 9.8 m long (angle of inclination is `30^(@)`) is

A

1/2 sec

B

2sec

C

4sec

D

1sec

Text Solution

Verified by Experts

The correct Answer is:
B

`S = ut + 1/2 at^2`
`rArr 9.8 = 1/2 (g sin theta) t^2`
`rArr 1/2 (g sin 30^@) t^2`
`rArr 9.8 = 1/2 xx 9.8 xx 1/2 xx t^2`
`rArr t = 2s`
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