Question

Why do you that the one that carry 1kg object travel much faster

Answer 1

Answer:

The general equation of relativity says the energy E associated with the mass M is given by,

E=MC^2,. C being the speed of light.

But you can not simply judge by the same equation that for an object of mass 1kg, energy required will be C^2 Joules.

Actually when any object reaches the speed comparable to the speed of light , it's mass doesn't remain constant anymore. The change in mass with the speed is given by,

M'= M/sqrt{1-(v/c)^2}

So you imagine that you took the mass nearer to the speed of light , then you must realize from the expression above that the mass of the object will tend to infinite!!

Hence the energy required for this task will be infinite.

So unless you have the infinite source of energy , you cannot take any object in this universe nearer to the speed of light.

Explanation: