# Find g on planet whose mass is 5 times the mass of earth and radius is 2 times radius of earth

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by prakritiV

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by prakritiV

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On the surface of Earth,

g = G M / R²

On the surface of another Planet:

g' = G M' / R'²

Given M' = 5 M and R' = 2 R

So, g' / g = (M' / M) * (R/R')²

= 5 * (1/2)² = 5/4

**Hence g' = 1.25 g**

g = G M / R²

On the surface of another Planet:

g' = G M' / R'²

Given M' = 5 M and R' = 2 R

So, g' / g = (M' / M) * (R/R')²

= 5 * (1/2)² = 5/4