Respuesta :
The worker used the power of 18.75 watts
Answer: Option A
Explanation:
Power refers the amount of work done in a unit time. So it is directly proportionate to the force exerted to perform a work and inversely proportionate to the time taken to complete the work. Thus if a work is completed within less time, then the power required to do that work is more. The unit of power is watts.
[tex]\text { Power }=\frac{\text {Workdone}}{\text {Time}}[/tex]
As work done is the amount of force required to complete the work of displacing an object to complete the work.
[tex]\text { Workdone }=\text { Force } \times \text { Displacement }[/tex]
Thus, the equation is
[tex]\text { Power }=\frac{\text { Force } \times \text { Displacement }}{\text { Time }}[/tex]
So, by applying given values, we get,
[tex]\text { Power }=\frac{450 \mathrm{N} \times 5 \mathrm{m}}{2 \times 60 \mathrm{s}}=18.75 \mathrm{watt}[/tex]
Thus the power required by the worker is 18.75 watts.
