A mass of \( 2 \mathrm{~kg} \) is whirled in a horizontal circle by means of a string at an init...

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A mass of \( 2 \mathrm{~kg} \) is whirled in a horizontal circle by means of a string at an initial speed of 5 revolutions per minute. Keeping the radius constant the tension in the string is doubled. The new speed is nearly
[MP PMT/PET 1998; JIPMER 2000]
(a) \( 14 \mathrm{rpm} \)
(b) \( 10 \mathrm{rpm} \)
(c) \( 2.25 \mathrm{rpm} \)
(d) \( 7 \mathrm{rpm} \)
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