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Look at the picture then answer the question
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Look at the picture then answer the question

Look at the picture then answer the question-example-1
User Zourbuth
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If there is no friction, then the total energy of the pendulum is constant.
No matter where it is in its swing, the sum of

(its potential energy) plus (its kinetic energy)

is always the same number.
User Jnnnnn
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