How long does it take for light from a star that is 12 light years away to reach earth

Ared apple is illuminated by a blue light the apple will appear

Using the work energy theorem. what is the velocity of a 850kg car after starting at rest when 13,000j of work is done to it.

In all trials, the magnitude of the final velocity for g1 + g2 was less than the magnitude of any initial velocity. as mass increased, what happened to the velocity? the velocity decreased. the velocity increased. the velocity of g1 + g2 could not be measured. the velocity was not affected by the mass increase.