An astronaut with a mass of 100 kg throws a wrench with a mass of 2 kg at a velocity of 5 m/s. What is the resulting recoil velocity of the astronaut if both the wrench and astronaut were initially at rest together?
momentum after = momentum before = 0
0 = 2*5 - 100 v
v = 10/100 = 0.1posted by Damon
M1*V1 = -M2*V2.
100*V1 = -2*5,
V1 = -0.1 m/s.
posted by Henry