Answer to Question #3845 in Mechanics | Relativity for mia
average velocity of 625 m/s. What is the velocity of the rocket after the fuel has burned?
(Ignore effects of gravity and air resistance.)
V1 - velocity of the rocket after the fuel has burned,
V2 - average velocity of burned fuel.
According to the law of conservation of linear momentum:
0 = m1V1 - m2V2
V1 = V2*m2 / m1
V1 = 625*0.05/4 = 7.8125 m/s
So, the velocity of the rocket is 7.8 m/s.
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