Jill does twice as much work as Jack does and in half the time. Jill's power output is
A) the same as Jack's power output.
B) four times Jack's power output.
C) twice Jack's power output.
D) one-half as much as Jack's power output.
E) one-fourth as much as Jack's power output.

Question

Quizplus · Accepted Answer

Power is defined as the work done per unit time. Since Jill does twice as much work in half the time, her power output is $2 \times 2 = 4$ times that of Jack's.

Jill Does Twice as Much Work as Jack Does and in Half