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PROBLEM:

A pendulum consists of a string of length L=4.50m and a bob of mass m=1.6kg. The string is brought to a horizontal position and the bob is given the minimum initial speed enabling the pendulum to make a full turn in the vertical plane with the string staying stretched to full length the whole way around. What is the maximum kinetic energy of the bob?

I have tried what seems like a million times to solve this. I tried using the conservation of mechanical energy formula which is:

Kf + Uf= Ki +Ui where K is kinetic energy and U is potential energy. I ended up with .5 *m *vsquared = m* g * h and then solving for velocity and then plugging it into .5 *m *vsquared and solving for kinetic energy.

Somehow though that doesnt seem right but i am unsure of what else I can do.

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# Pendulum problem Need help

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