Answer:
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
Answer: 830.55 J
Explanation:
PE of adult = 82.5*9.8*1.25 = 1,010.625
PE of child = 14.7*9.8*1.25 = 180.075
PE of adult - PE of child = 830.55 J
