Question

Construction worker used 450 N of force to move materials 5 meters in 2 minutes.

How much power did the worker use?

A)
18.75 watts


B)
125 watts


C)
225 watts


D)
1125 watts

Answer 1

Power = Δenergy/Δtime or Δwork/Δtime

To solve this problem you first have to find what the energy or work value is. In this case I am going to solve for work.

Work = force × distance
= 450 × 5
Work = 2250 J

Now that you know what the work value is you plug it into the power formula

P = Δwork/Δtime
= 2250 J/2 min
Power = 1,125 watts


hope this helps :)

Answer 2

Answer: A. 18.75Watts

Step-by-step explanation:

Power is defined as the rate of change of work done by a body. It is measures in Nms-¹ or watts.

Mathematically,

Power = Work done/time taken

Workdone = Force × distance moved in a specified direction.

Also note that the time must be in seconds being the standard unit.

Given Force = 450N

Distance = 5m

Time = 2minutes = 2 × 60 = 120seconds

Since Power = F × d/t

Power = 450 ×5/120

Power = 18.75 watts.