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hear is the problem:

An astronaut has a mass of 50 kg.

A.) how much does she weigh before lift off?

B.) when her space vehicle is 6400 Km. above the earth's suface, she will weigh one quarter of what she weighed on earth. what does she weigh at this point?

so there you are, ps i know this formula but i don't understand it. Fnet = ma

net force= mass times acceleration? righ?