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Gravitational potential energy increases

When an 81.0-kg adult uses a spiral staircase to climb to the second floor of his house, his gravitational potential energy increases by 2.25x10^3 J. By how much does the potential energy of a(n) 18.5-kg child increase when the child climbs a normal staircase to the second floor?

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## Q : Symbolic expression for the ratio of the proton

Find a symbolic expression for the ratio of the proton stopping potential and the electron stopping potential, ΔVp/ΔVe. The answer should be in terms of the proton mass mp and electron mass me.