Question

A boy has to do 840 J of work in time 2 minutes to lift the luggage to the roof of the bus.
How much power does he spend

Answer 1

Answer:

boy has to do 840 J of work in time 2 minutes to lift the luggage to the roof of the bus.

How much power does he spend

Explanation:

Answer 2

P = W/t

Here, work to be done = 840 J

Time = 2 mins = 120 s

∴ P = (840 J)/(120 s)

⇒ P = 84/12 W

⇒ P = 7 W.

∴ He had a power of 7 W.

More:

• The SI unit of power is W named by James Watt.
• Power: Work done per unit time.