Q.

A pendulum of length 2m released at P. When it reaches Q, it losses 10% of its total energy due to air resistance. The velocity at Q is

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a

6 m/sec

b

1 m/sec

c

2 m/sec

d

8 m/sec

answer is A.

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Detailed Solution

If v is velocity of pendulum at Q and 10% energy is lost while moving from P to Q Hence, by applying conservation of between P and Q12mv2=0.9 (mgh)⇒v2=2×0.9×10×2⇒v=6 m/sec
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A pendulum of length 2m released at P. When it reaches Q, it losses 10% of its total energy due to air resistance. The velocity at Q is