Is work defined as the product of power applied to a system and the time used while power is applied?

Question

If work is done on a moving mass which changes velocity with its moving force ,can than power be considered constant?

Answer 1

Sometimes you ask thought-provoking questions and sometimes you ask rather elementary questions like this one. I think you already know the answer, unless it's asked on an unstated level (e.g., having to do with relativity or cosmology). Anyway, the work, or energy, is the time integral of the power. If power is constant, you can say it's the product of power and time of application.

Answer 2

Work=force x distance

Power=work/time

Work=power x time