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3. A spaceship of mass 2.80 10 6 kg is to be accelerated to a speed of 0.765 c . (a) What minimum amount of

3. A spaceship of mass 2.80 106 kg is to be accelerated to a speed of 0.765c.

(a) What minimum amount of energy does this acceleration require from the spaceship's fuel, assuming perfect efficiency? __________J

(b) How much fuel would it take to provide this much energy if all the rest energy of the fuel could be transformed to kinetic energy of the spaceship? ___________kg

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