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A 5,560 kg lander (weight does not include fuel) must travel to the surface of the...

A 5,560 kg lander (weight does not include fuel) must travel to the surface of the moon and back, requiring a delta-v (change in speed) of 18.7 kilometers per second. If the specific impulse (exhaust velocity, ve) of the rocket is 4.13 kilometers per second, how much fuel will be necessary according to the Rocket Equation? Assume all fuel is burned.

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