What is the difference in pe between a 82.5kg adult on a 1.25 m wall, and a 14.7 kg child on the same wall? (unit=j)

The difference in potential energy is, ΔE = 266.63 J

Explanation:

Given,

The mass of the adult, M = 82.5 Kg

The mass of the child, m = 14.7 Kg

The height of the wall, h = 1.25 m

The potential energy of the adult, P.E = Mgh J

                                                               = 82.5 x 9.8 x 1.25

                                                              = 398.13 J

The potential energy of the child, p.e = mgh J

                                                               = 14.7 x 9.8 x 1.25

                                                               = 171.5 J

The difference in their potential energy, ΔE = P.E - p.e

                                                                       = 398.13 - 171.5

                                                                       = 226.63 J

Hence, the difference in potential energy is, ΔE = 266.63 J

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