Question: A mass of 2 kg is whirle ‘d 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 double. The new speed is nearly
(A) 2.25 rpm
(B) 7 rpm
(C) 10 rpm
(D) 14 rpm
Answer: option(B)
solution:
