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MCQ
A centripetal force of 8 N keeps a 2 kg body moving in a circle of radius 4 m. The speed of the body is:
Unit-4 Dynamics-2
A 2 m/s
B 8 m/s
C 16 m/s
D 4 m/s
Explanation

F = mv^2/r gives 8 = 2v^2/4, so v^2 = 16 and v = 4 m/s.

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