Q: A 10 kg stone is suspended with a rope of breaking strength 30 kg wt. the minimum time in which the stone can be raised through a height 10 m starting from rest is (taking g = 10 N/kg)

(a) 0.5 seconds

(b) 1.0 seconds

(c) $\sqrt{\frac{2}{3}}$ seconds

(d) 2.0 seconds

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Ans: (b)