Question

A ball moves in a circle at the end of a string, as shown. Which arrow represents the centripetal force responsible for this motion? W X Y Z

Answer 1

the answer i believe is y, the arrow pointing towards the center of the circle. 

Answer 2

Arrow Y represents centripetal force.

Solution:

Centripetal force is the force acting in a circular motion, it is directed towards the center.

In the above diagram only arrow Y represent directions of force towards the center, So Y represents centripetal force.