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The radius of earth is about 6400 km and that of mars is 3200 km. The mass of the earth is about 10 times mass of mars. An object weighs 200 N on the surface of earth. Its weight on the surface of mars will be

Asked in NEET 1994 · Comparing planets

Answer: (3) 80 N

Step-by-step solution

Surface gravity is g=(GM)/(R²), so weight scales as M/(R²).

Mars has 1/(10) of the earth's mass and half its radius.

(gₘ)/(gₑ)=1/(10)×((Rₑ)/(Rₘ))²=1/(10)×4=0.4.

Wₘ=0.4×200.

Wₘ=80 N.

Why the other options are wrong

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