Suppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has a mass of 4.9 10^8 kg. Consider the kinetic...

Suppose a spaceship has the mass of a typical ocean cruise ship, then it can be assumed that it has a mass of 4.9 × 10^8 kg. Consider the kinetic energy required at 7 % of the speed of light. If energy to get a spaceship to cruising speed is generated using matter-antimatter annihilation, what mass of antimatter in kg is required?