Question

Calculate the energy needed to accelerate a spaceship of mass 10,000 kg to a speed of 0.3c for intergalactic space exploration. Compare with the projected energy usage of the Earth in a decade~10^22J?
well i don't know how to start the problem

Answer 1

Formula:E=mc^2

Answer 2

(1/2) m v^2
= 5,000 * (.3*3*10^8)^2
= 5*10^3 * .81 * 10^16

= 4.05 * 10^19