In a weightlifting competition, Jenna does 150 Joules of work in 3 seconds. How much power did she use?

50 W

Explanation:

Power: This can be defined as the rate at which work is done or it is the rate at which energy is used. The S. I unit of power is Watt (W).

The formula for power is given as

P = W/t ... Equation 1

Where P = amount of power used by Jenna, W = Work done by Jenna, t = time taken to do the work.

Given: W = 150 J. t = 3 Seconds,

Substitute into equation 1

P = 150/3

P = 50 Watt.

Hence Jenna uses 50 W of power

50 W

Explanation:

By definition, power is the rate at which work is done or of transferring heat, i. e. the amount of energy transferred or converted per unit time. Its unit is Watt or J/s.

Mathematically,

Power = workdone/time

Given:

Workdone = 150 J

Time = 3 s

Power = 150/3

= 50 W.