Assume that a rocket has infinite energy and is able to continuously generate a constant force. Then, according to Newton's second law of motion,
"acceleration = force / mass,"
and hence, a certain acceleration is generated. This causes a constant increase in the velocity of the rocket, which eventually travels faster than the speed of light.
If "force" is fixed, then "mass" should change.
In other words, for the rocket to travel as fast as light, the acceleration should become negligible, and the mass should become infinite.
The following formula shows the increase in mass:

: relative mass of the object during motion
: mass of the same object when at rest
: relative speed
: speed of light

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