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MCQ
A stone of mass 2 kg is whirled with a string of length 4 m. If the string can bear a maximum tension of 50 N, the maximum speed with which the stone can be whirled is:
Unit-4 Dynamics-2
A 10 m/s
B 5 m/s
C 20 m/s
D 100 m/s
Explanation

v = sqrt(F*r/m) = sqrt(50 x 4/2) = sqrt(100) = 10 m/s.

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