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A ladder 13 m long leans against a wall....

A ladder 13 m long leans against a wall. The foot of the ladder is pulled along the ground away from the wall, at the rate of 1.5m/sec. How fast is the angle between the ladder and the ground is changing when the foot of the ladder is 12 m away from the wall.

Text Solution

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The correct Answer is:
`(-3)/(10"rad/s"`
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