Question

A boy on a bicycle drags a wagon full of newspapers at 0.80 m/s for 30 min using force of 40 N. how much work he ha the boy done

Answer 1

Answer:

★W (work) = ? (in Joule ou kg.m²/s²)

★F (force) = 40 N (or 40 kg.m/s²)

★d (distance) = ? (in m)

★s (average speed) = 0.800 m/s

★t (time) = 30 min = 30*(60sec) = 1800 s

Apply the data to the average speed formula, we will have:

S = \dfrac{d}{t}S=

t

d

d = S×td=S×t

d = 0.800\:\dfrac{m}{\diagup\!\!\!\!s} *1800\:\diagup\!\!\!\!sd=0.800

╱s

m

∗1800╱s

\boxed{d = 1440\:m}\Longleftarrow(distance)

d=1440m

⟸(distance)

Applying the Force formula parallel to the displacement, we have the following work:

W = F × dW=F×d

W = 40\:kg×\dfrac{m}{s^2} ×1440\:mW=40kg×

s

2

m

×1440m