Answer:
22.2 W
Explanation:
First of all, we calculate the work done by moving the wagon, using the formula:
[tex]W=Fdcos \theta[/tex]
where
F = 20 N is the magnitude of the force
d = 1000 m is the displacement of the wagon
[tex]\theta=0^{\circ}[/tex] is the angle between the direction of the force and of the displacement (assuming the force is applied in the direction of motion)
Substituting, we find
[tex]W=(20)(1000)=20,000 J[/tex]
Now we can find the power generated, which is equal to the ratio between the work done and the time taken:
[tex]P=\frac{W}{t}[/tex]
where
W = 20,000 J
t = 15 min = 900 s
Substituting,
[tex]P=\frac{20000}{900}=22.2 W[/tex]
And the same value in Joules/second (remember that 1 Watt = 1 Joule/second)
