Question

A rock is whirled around in a circle with a slingshot. As the rock leaves the slingshot, it has an instantaneous velocity in a straight line. How do Newton's laws of motion explain this?

Answer 1

He states that a body continues in a state of rest or uniform motion in a straight line unless it is acted on by an external force

Answer 2

D)To move in a circle requires an acceleration and therefore a net force. This force is supplied by the slingshot.