A model rocket is fired vertically from rest. It has a constant acceleration of 15.3 m/s^2 for the first 1.50 s. Then it’s fuel is exhausted, and it is in free fall. The rocket has a mass of 92.1g, the mass of the fuel is much less than 92.1 g. Ignore air resistance. What is the upward net force on the rocket during the first 1.50 s after liftoff? What is the upward force exerted on the rocket by the burning fuel? How long does the rocket travel? How long after liftoff does the rocket return to the ground?

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