On a planet whose size is the same and mass four times as that of our earth, find the amount of work done to lift `3 kg` mass vertically upwards through `3 m` distance on the planet. The value of `g` on the surface of earth is `10 ms^(-2)`
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Here `R_(P)=R_(e),M_(P)=4,M_(e)` `M=3kg, h=em,g_(e)=10m//s^(2)` On the surface of the earth `g_(e)=(GM_(e))/(R_(e)^(2)` On the surface of the planet `g_(P)=(GM_()P)/(R_(P)^(2))=(G4M_(e))/(R_(e)^(2))=3(GM_(e))/(R^(2))=4g_(e)` `g_(P)=4xx10=40m//s^(2)` work done `=mg_(p)h=3xx40xx3=360J`
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