# Conservation of Energy

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A simple pendulum has a length of 0.75 m and a bob whose mass is 0.15 kg. The bob is released from an angle of 25 degrees relative to a vertical reference line. a) Show that the vertical height of the bob when it is released is h=L(1-cos25 degrees). b) What is the kinetic energy of the bob when the string is at an angle of 9.0 degrees? c) What is the speed of the bob at the bottom of the swing? (neglect friction and the mass of the string)

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#### Solution Summary

The solution calculates the Kinetic energy of the pendulum bob and its speed.

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