Question

After sliding down a slide will all the potential energy of a boy be lost?

Answer 1

Yes In nature there is flow of energy from higher state to lower state
At higher point it had potential energy
but when boy slide potential energy is gradually converted into kinetic as well as friction b/w boys and slider.
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Answer 2

No, energy is never lost or gained.It changes from one form to another.

After sliding down the potential energy of a boy will change to kinetic energy.
As the boy slides down energy is possessed by the virtue of its motion.

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