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AP® Physics 1 & 2

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Mars Mass

APPH12-FDFXKG

Two astronauts, Susan and Bob, travel to Mars and begin discussing Bob's mass.

Bob: My weight on Earth is 600 N. Mars' gravity is 2.65 times less that of Earth's. Therefore my mass on Mars is 227 kg.

Susan: If your weight on Earth is 600 N, your mass on Earth is 61.2 kg. Since Mars' gravity is 2.65 times less that of Earth's, your mass on Mars is 2.65 times less your mass on Earth. This means your mass on Mars is 23.1 kg.

Who is correct?

A

Bob is correct.

B

Susan is correct.

C

Both Bob and Susan are correct.

D

Both Bob and Susan are incorrect.