Question

A child pulls on a wagon with a horizontal force of 75 N. If the wagon moves horizontally a total of 42 m in 1.5.0 min, what is the average power generated by the child? A) 53 W B) 35 W C) 46 W D) 43 W

Answer 1

B) 35 W

Step-by-step explanation:

Force applied by child = 75 N = F

Distance travelled by child = 42 m = d

Time traveled for is 1.5 min = 1.5×60 = 90 seconds = t

Work done by the child

W = Fdcosθ

⇒W = 75×42cos0

⇒W = 3150 Joule

Power is defined as work done per unit time

`P=(W)/(t)\\\Rightarrow P=(3150)/(90)=35\ W`

∴ The average power generated by the child is 35 W