A model rocket is fired vertically from rest. It has a net acceleration of 17.5 m/s^2. After 1.5s, its fuel is exhausted and its only acceleration is that due to gravity. The rocket has a mass of 87g and you may assume the mass of the fuel to be much less than 87g. What was the net force on the rocket during the first 1.5 s after liftoff? What force was exerted on the rocket by the burning fuel? What was the net force on the rocket after its fuel was spent? The rocket's vertical velocity was zero instantaneously when it was at the top of its trajectory. What were the net force and acceleration on the rocket at this instant?
2007-09-23
17:13:49
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2 answers
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asked by
Shawn
1
in
Science & Mathematics
➔ Physics