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Law of Conservation of Energy

A boy weighin...

Question

A boy weighing $40 k g$ makes a high jump of $1.5 m$ vertically upwards.
(i) What is his kinetic energy at the highest point?
(ii) What is his potential energy at the highest point?

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Solution

(i) the kinetic energy at highest point is zero ( v = 0)
(ii) potential energy at highest point = mgh = 40 x 9.8 x 1.5 = 588 J

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