# physics

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A model rocket is propelled upward by a cylinder of compressed water. The cylinder emits water at a rate of 0.050 kg/second with an exit speed of 80.0 m/s. Initially, the rocket has a mass of 0.15 kg, including the water cylinder. What is the rocket's initial upward acceleration? Don't forget to add in the downward force of gravity.

• physics -

at liftoff.

Remember force is the rate of change of momentum.

mg+(masswater+massrocket)a=fuelrate*velocity

solve for a

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