The PE will remain same on the earth and on planet A.
Mass is same on both the surface since we are talking about the same person, now weight = mg such that
Weight on earth = 2(weight on planet A)
Mg on earth = 2(Mg’ on planet A)
Equating PE on both the planets.
∴ Mgh on earth = Mg’h’ on planet A
2Mg’h = Mg’h’
h’ = 2(0.4) = 0.8 m
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