Speed of Light
To get a spaceship to speed of light we need a work done of 2.99997 * 10^13 N m or say it 2.99997*10^13 J (only if the mass of the space ship is 99999kg).
But the mass of the spaceship will continuously increase to a point when accelerating to speed of light this increases the difficulty.
Unless like other engines which give a thrust by combustion if we try to accelerate electrons to speed of light so it is more easier and effective way. As the mass of the electron is very low so it is easier to accelerate it to speed of light which means we have to accelerate 6.2499373*10^22 electrons per second with speed of light to get the work to accelerate a spaceship with speed of light. As a electron can generate work of 4.8*10^-11 if accelerate to speed of light.
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