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4. Find the velocity of the ball when the string makes an angle of 60o with vertical. The string length is 2m and mass of the ball is 0.05 kg. Initially at the bottom most point the ball is given a velocity of 10 m/sec

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a

25 m/sec

b

4 m/sec

c

45 m/sec

d

8 m/sec

answer is C.

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Detailed Solution

We have to apply the work energy theorem. Work done by gravity = change in kinetic energy.h=21−Cos⁡60∘=1m12m102−v2=mg×1⇒v2=80⇒v=45m/sec

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