a stone of mass 50g is being rotated in circle of radius 50cm with a uniform speed of 2m/s.what is the acceleration of the stone?

Answer 1

Acceleration of an object in circular motion is:
magnitude = v²/r
v = 2 m/s
r = 0.5 m
Direction is towards the centre of the circle.

Mass is irrelevant (unless you need the force on the string).

Answer 2

I can't understand this