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MCQ
At the bottom of a vertical circle of radius 5 m the tension is three times the weight of the body (g = 10 m/s^2). The speed of the body is:
Unit-4 Dynamics-2
A 5 m/s
B 15 m/s
C 20 m/s
D 10 m/s
Explanation

T = m(v^2/r + g) = 3mg gives v^2/r = 2g, so v = sqrt(2gr) = sqrt(2 x 10 x 5) = 10 m/s.

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