A golf ball (m = 46.0 g) is struck with a force that makes an angle of 45.7: Impact of force

A golf ball (m = 46.0 g) is struck with a force that makes an angle of 45.7° with the horizontal. The ball lands 207 m away on a flat fairway. If the golf club and ball are in contact for 7.06 ms, what is the average force of impact? (Neglect air resistance.)

Solution Summary

With equations, calculations and a graph, the problem is solved.

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*Please see attachment for diagram.
Question:
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The ball has a weight of 15 lb and is fixed to a rod having a negligible mass. If it is released from rest when theta = 0 deg., determine the angle theta at which the compressive force in the rod becomes zero (see attachment for an illustration)
answer should be 48.2 deg. Not sure how to get there though.