(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A girl pushes her little brother on his sled with a force of 300N for 750m. How much work is done if the force of friction is a) 200N and b) 300N?

2. Relevant equations

[tex] W = F \Delta x [/tex]

3. The attempt at a solution

[tex] F_{net} = F_p - F_f [/tex]

[tex] F_{net} = 300N - 200N = 100N [/tex]

[tex] W = F \Delta x [/tex]

[tex] W = (100N)(750m) = 75000 N{\cdot}m = 7.5 x 10^4 J [/tex]

That answer is wrong, its supposed to be 2.25 x 10^5 J

what did i do wrong?

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# Homework Help: Human push Work Problem

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