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A certain pendulum has a potential energy of 20 J when it is at the top of its swing. a. What is the kinetic energy?

A certain pendulum has a potential energy of 20 J when it is at the top of its swing.

a. What is the kinetic energy?

b. When the pendulum reaches a certain point in its downward motion it has a potential energy of 5 J. What is its kinetic energy?

c. At the bottom of the swing its potential energy is zero. What is its kinetic energy?

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