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A pendulum is made by tying a 0.50 kg ball to a 0.75 m long string....

A pendulum is made by tying a 0.50 kg ball to a 0.75 m long string. It is pulled back to an angle of 35 degrees from the vertical, and then released from rest.

(a) determine the change in the gravitational potential energy between the moment it is released and the moment it reaches the bottom of its swing. (The anwser is -0.665J)

(b) Determine the speed when it is at the bottom of the swing. (the answer is 1.63 m/s)

(c) On the way back up, what angle is it at when it is at one half of it’s maximum speed?(the answer is 30 degrees)

Especially for the (c) question, I don’t know how to do it.

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