# A body crosses the topmost point of a vertical circle with critical speed. What will be its centripetal acceleration when the string is horizontal:

A body crosses the topmost point of a vertical circle with critical speed. What will be its centripetal acceleration when the string is horizontal:

a} 1g

b} 2g

c} 3g

d} 4g

$$V=\sqrt{3gr}$$
$$a={v^2\over r}$$
$$a={3gr\over r}= 3g$$