#628 A girl is whirling a ball on a string around

A girl is whirling a ball on a string around - Physics

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Free Chegg Question

A girl is whirling a ball on a string around her head in a horizontal plane. She wants to let go at precisely the right time so that the ball will hit a target on the other side of the yard. When should she let go of the string?

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Free Chegg Answer

 

The girl should let of go the string at the instant the ball is directly opposite the target because now the centripetal force becomes zero as the radial acceleration is zero and the ball has only tangential acceleration and hence the ball will fly off tangentially and hit the target.