Question

A string 0.5 m long is used to whirl a 1 kg stone in a vertical circle at a uniform velocity of 5 m/s. What is the tension in the string when the stone is at the top of the circle?

(a) 9.13 N

(b) 30.4 N

(c) 40.2 N

(d) 59.8 N

Answer 1

Correct option (c) 40.2 N

Explanation :

The centripetal force needed to keep the stone moving at 5 m/s is