Earth’s radius is 6400 km, Mars’s radius is 3200 km, and Earth’s mass is ten times Mars’s mass. If a body weighs 200 N on Earth, what will it weigh on Mars?
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Earth’s radius is 6400 km, Mars’s radius is 3200 km, and Earth’s mass is ten times Mars’s mass. If a body weighs 200 N on Earth, what will it weigh on Mars?

G1 Physics · Accepted Answer

Step 1: Weight on a planet is W=GMm/R². Step 2: Wₘ/Wₑ=(Mₘ/Mₑ)(Rₑ/Rₘ)²=(1/10)×2²=0.4, so Wₘ=0.4×200=80 N. Final answer: C — 80 N.