Physics Practice Problems Intro to Forces + Newton's Laws Practice Problems Solution: In outer space, where there is no gravity or air, ...

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Solution: In outer space, where there is no gravity or air, an astronaut pushes with a force of 25 N on a 2 kg moon rock with one hand and force of 25 N on a 4 kg moon rock with the other. Which of the following is true? A) Both rocks will push back at the astronaut with 25 N. B) Since the astronaut is weightless, he cannot push on the rocks. C) Since both rocks are weightless, they do not push back on the astronaut. D) The 4 kg rock pushes back on the astronaut twice as hard as the 2 kg rock. E) Since both rocks are weightless, they will have the same acceleration. 

Problem

In outer space, where there is no gravity or air, an astronaut pushes with a force of 25 N on a 2 kg moon rock with one hand and force of 25 N on a 4 kg moon rock with the other. Which of the following is true?

A) Both rocks will push back at the astronaut with 25 N.

B) Since the astronaut is weightless, he cannot push on the rocks.

C) Since both rocks are weightless, they do not push back on the astronaut.

D) The 4 kg rock pushes back on the astronaut twice as hard as the 2 kg rock.

E) Since both rocks are weightless, they will have the same acceleration.