An astronaut whose mass is 80 kg carries an empty oxygen tank with a mass of 10 kg. The astronaut throws the tank away with a speed of 2.0 m/s. With what velocity does the astronaut start to move off into space?

The speed of the astronaut is 0.25 m/s in the opposite direction to the oxygen tank.

Explanation:

Using the conservation of linear momentum, we have:

The initial momentum is zero because both of them are at rest, so we just have a final momentum.

Therefore, the speed of the astronaut is 0.25 m/s in the opposite direction to the oxygen tank.

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