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If a astronaut has a mass of 100 kg, the rock has a mass of 200 kg, and the rock gains a velocity of 2 m/s to the right, what velocity does the astronaut

gain to the left?


Law of conservation of momentum 
m1*v1 = -m2*v2
100*v1 = - 200*2
v1 = -4
0 0 0
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