Physics Problem - Force and the Laws of Motion - Newton's Laws Dynamic - Rocket Power

A rocket of initial mass 125 kg (including all the contents) has an engine that produces a constant vertical force (the thrust) of 1720 N. Inside this rocket, a 15.5 N electric power supply rests on the floor.
(a) Find the initial acceleration of the rocket.
(b) When the rocket initially accelerates, how hard does the floor push on the power supply? (Hint: Start with a free-body diagram for the power supply.)

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