Question

A stone is tied to a 0.5-m string and whirled at a constant speed of 4.0m/s in a
vertical circle. Its acceleration at top of the circular path is:
A. 9.8 m/s2, up
B. 9.8 m/s2, down
C. 8.0 m/s2, up
D. 32 m/s2, down
E. 32 m/s2, up