Posted by **kelly** on Friday, April 8, 2011 at 11:04pm.

A boy on a bucycle drags a wagon full of newspapers at 0.80m/s for 30 minutes using a force of 40N. How much work has the boy done?

- Physics -
**Jai**, Friday, April 8, 2011 at 11:47pm
recall that speed is distance traveled per unit time, or

v = d/t

also recall that work is force exerted times distance, or

W = Fd

since in the problem we are only given the force, we calculate for the distance first.

substituting the given speed and time to formula for speed:

v = d/t

0.8 = d/(30*60)

d = 0.8*30*60 = 1440 m

note: we multiplied 30 by 60 to convert units to seconds.

substituting to get work,

W = Fd

W = 40*1440

W = 57600 J or 57.6 kJ

hope this helps~ :)

- Physics -
**nianz**, Saturday, September 1, 2012 at 4:36am
the answer should be 0J

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