Question

If two people lift identical stacks of books the same distance and one person does the job twice as fast, which of the following has doubled?

-power

-work output

-work input

-efficiency








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Answer 1

Power

Step-by-step explanation:

The formula for power is Work divided by time taken, so P=W/T.

That case, involved power, since one of the people did work twice as fast, but, it was the same amount of work each person did, for the same distance (not exact distance, but usually the same)

Answer 2

Power

Step-by-step explanation:

Power is defined as the rate of doing work with reference to the time spent and the formula is force multiplied by velocity.

In this case, if two people lift identical stacks of books the same distance and one person does the job twice as fast, then it means the velocity in the case is doubled which will also lead to an increase in the Power .