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JEE PHYSICS MCQ: SYSTEM OF PARTICLES

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A stone of mass 2 kg2 {~kg} is attached to one end of string of length 5 m5 {~m}, is revolved around a stick so that the string winds upon the stick and gets shortened. Angular velocity of stone was 5 rad/s5 \,{rad} / {s} initially. Find angular velocity of the stone when length of the string become 2 m2 {~m}.
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Correct option: A
1254rad/s\frac{125}{4} {rad} / {s}
Option A (1254rad/s\frac{125}{4} \mathrm{rad} / \mathrm{s}) is correct because it is derived from the conservation of angular momentum.

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