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## Homework Statement

A 63 kg astronaut at rest in space throws a 10 kg oxygen tank with a speed of 12 m/s. What is the velocity of the astronaut immediately after throwing the tank?

Which formula would I use to solve this? Thanks in advance.

- Thread starter Mike667
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- #1

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A 63 kg astronaut at rest in space throws a 10 kg oxygen tank with a speed of 12 m/s. What is the velocity of the astronaut immediately after throwing the tank?

Which formula would I use to solve this? Thanks in advance.

- #2

nrqed

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Conservation of momentum. Here, the total momentum before was zero. so th etotal momentum after will be zero.## Homework Statement

A 63 kg astronaut at rest in space throws a 10 kg oxygen tank with a speed of 12 m/s. What is the velocity of the astronaut immediately after throwing the tank?

Which formula would I use to solve this? Thanks in advance.

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Yes, thats what i was thinking. thanks again.

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Is the answer 1.9 m/s?

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I get .........120/63.

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oh really?I get .........120/63.

actually, its -1.9 m/s because the astronaut goes backwards.

Last edited:

- #7

cristo

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I think you may mean -1.9m/soh really?

actually, its -9.1 m/s because the astronaut goes backwards.

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Haha, yeah ill change it.

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Yes, and I actually chose the sign convention as such. Good lord trying to be helpful. And you'll notice, the question states the problems in terms of speed and asks for velocity. Either answer is correct.oh really?

actually, its -9.1 m/s because the astronaut goes backwards.

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