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A ladder 5m long rests against a vertica...

A ladder `5m` long rests against a vertical wall. If its top slides down at the rate of `10 cm //sec`, then, when the foot of the ladder is `4 m` away from the wall, the angle between the floor and the ladder is decreasing at the rate of

A

`1/10 rad//s`

B

`1/20 rad//s`

C

`20 rad//s`

D

`10 rad//s`

Text Solution

Verified by Experts

The correct Answer is:
B
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