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Conservation of linear momentum

"A 122 kg astronaut (including space suit) acquires a speed of 2.50 m/s by pushing off with his legs from a 1900 kg space capsule. What is the change in speed of the capsule?"

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We have by conservation of linear momentum,
<br>
<br>initial momentum = final momentum of the system
<br>
<br>Both the capsule and the ...

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