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Can a rocket reach a speed greater than the speed of the exhaust gases that propel it? Explain why or why not.

Can a rocket reach a speed greater than the speed of the exhaust gases that propel it? Explain why or why not.

Grade:10

1 Answers

Jitender Pal
askIITians Faculty 365 Points
8 years ago
No, the rocket can never reach a speed greater than the speed of the exhaust gases that propel it. This can be seen from the fact that the thrust on the rocket is given by 235-1369_1.PNGterm is negative, the thrust points in the direction of the velocity vector of the rocket. However, if the final speed of the rocket exceeds the velocity of the exhaust gases, the thrust would reverse its direction and would now point in the direction opposite to the direction of velocity vector of rocket. This will decrease its speed and eventually the rocket will end up moving with lower velocity again.

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