Question

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)PLEASE HELP

Answer 1

Answer: 830.55 J

Step-by-step 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

Answer 2

The difference in potential energy is, ΔE = 266.63 J

Step-by-step 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