Question

A stone tied to the end of a string 80 cm long is whirled in a horizontal circle with a constant speed. If the stone makes 14 revolutions in 25 s, what is the magnitude and direction of acceleration of the stone?

Answer 1

Length of the string, l = 80 cm = 0.8 m
Number of revolutions = 14
Time taken = 25 s

The direction of centripetal acceleration is always directed along the string, toward the Centre, at all points.