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A ball of mass 2 kg is tied to one end of a string
of length 1 m and the other end of the string
is held fixed. The ball then swings in a vertical
circle of radius L. The speed of the ball at the
m
lowest point is 15 m/s.
Find speed of the ball when the string makes
angle 30° with vertical axis.
(Take g = 10 m/s², cos 30 = 0.86 and sin 30 = 0.5)
(a) 14.91 m/s
(b) 7.87 m/s
(c) 14.8 m/s
(d) 9.89 m/s
(e) 11.6 m/s

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