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Two planets have masses in the ratio 1: 10 and radii in the ratio 2 : 5 compare The acceleration due to gravity on their surface

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Acceleration due to gravity at surface `= g = (GM)/R^2`
Ratio of `g_1` and `g_2 = g_1/g_2 = M_1/M_2[R_2/R_1]^2 = 1/(10)[5/2]^2 = 5/8`
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