All observers measure the same speed of light.
Nothing can travel faster than the speed of light.
Mass and energy are equivalent, that is: E=mc2.
When something speeds up, it has more kinetic energy: K.E. = 1/2 m v2.
Because of the equivalence of mass and energy, the energy that an object has due to its motion will add it is rest mass. Therefore, an object moving at high velocity has more mass than it does at rest.
As an object moves at a very high speed, approaching the speed of light, its mass rises faster and faster, requiring more and more energy to make it move faster. Therefore, it would take an infinite amount of energy to make an object move at the speed of light.
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