50W of power is generated using 100J of work to move a box onto a shelf. How long did it take to move the box from the floor to the shelf?

Answer: time t = 2 seconds

Explanation:

Given that

Power P = 50W

Energy E = 100J

How long did it take to move the box from the floor to the shelf? This implies time taken.

Power is defined as the rate at which work is done. I. e

P = W. D/t

Where work done = energy

50 = 100/t

Make t the subject of formula

t = 100/50

t = 2 second