Physics
posted by Linda .
A 120 kg astronaut (including space suit) acquires a speed of 3.00 m/s by pushing off with his legs from an 1900 kg space capsule.
What is the change in speed of the space capsule? As the reference frame, use the position of the space capsule before the push.
if the push lasts 0.43 s, what is the average force exerted on the astronaut by the space capsule?

I do not know. I am having a hard time finding how to do this.
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