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A ball of mass 1 kg is hanging from 1 m long inextensible string which can withstand maximum tension of 400 N.

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A ball of mass 1 kg is hanging from 1 m long inextensible string which can withstand maximum tension of 400 N. Find the maximum speed (u) that should be given to the ball.

(1) √390 m/s

(2) √410 m/s

(3) 20 m/s

(4) 22 m/s

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Correct option is (1) √390 m/s

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