# Speed of light and relations to mass

• chgol5270

#### chgol5270

Being that anything accelerated to the speed of light gains infinite mass and will require infinite energy thus providing a barrier to achieving the speed of light but wouldn't the fuel source become infinite and in turn the potential for energy become infinite effectively canceling out this barrier.

Nope.

Nope.

Well said.

The increase in mass of the fuel is apparent only in another inertial frame. In the frame of the rocket it stays the same (decreasing as it is used up).

The increase in mass of the fuel is apparent only in another inertial frame. In the frame of the rocket it stays the same (decreasing as it is used up).

is what you're saying is that the increase in mass isn't from the perspective of said object ie. "rocket" but from the perspective of outside observations?

is what you're saying is that the increase in mass isn't from the perspective of said object ie. "rocket" but from the perspective of outside observations?

Yes, that is exactly what he is saying, and not just any "outside observations" but those that are taken from an inertial frame of reference that is moving rapidly from the point of view of the rocket. Look up "frame of reference".