Agirl is whirling a ball on a string around her head in
ahorizontal plane. she wants to let go at precisely the right
timeso that the ball will hit a target on the other side of the
yard. when should she let go of the string?

Answered

Explanation:

The girl whirling the ball should let go off ball when the ball is at a position such that tangent to the circle is in the direction of the target.

the tangent at any point in a circular path indicates the direction of velocity at that point. And the moment when the centripetal force is removed the ball will follow the tangential path at that moment.

the force on the thing and the distance the force moves the thing

the answer is b, have negligible mass