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A ball of mass 0.1 kg. is whirled in a h...

A ball of mass 0.1 kg. is whirled in a horizontal circle of radius 1 m. by means of a string at an initial speed of 10 rpm. Keeping the radius constant, the tension in the string is reduced to one quarter of itsinitial value. The new speed is

A

5 r.p.m

B

10 r.p.m

C

20 r.p.m

D

14 r.p.m

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