Question

a rock with a mass of 6.0 kilograms is being whirled in a horizontal circle on the end of a rope 1.6 meters long. if the speed of the rock is 2.7 meters per second, what is the magnitude of the centripetal acceleration

Answer 1

V^2/R

R is the rope length
V is the speed.

For the acceleration, you do not need the mass.