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

Jennifer applies a force of 2.0 N upon a 100.0 kg wagon, which was initially moving at 0.50 m/s. This force acts over a distance of 5.0 m. Assume friction can be neglected.

a) What is the wagon's velocity after Jennifer's push if she pushes the wagon in the direction of motion?

b) What is the wagon's velocity after Jennifer's push if her push opposes the wagon's motion?

2. Relevant equations

KE=.5v^{2}

lw-l=F[tex]\Delta[/tex]Xcos[tex]\theta[/tex]

w+=F[tex]\Delta[/tex]Xcos[tex]\theta[/tex]

3. The attempt at a solution

a) I got an initial KE of 12.5 J and an initial IE of 10 J. My ending KE was 22.55 J. My answer was a velocity of 0.67 m/s. Is this correct?

b) I got and initial KE of 12.5 J then my ending IE was -10 J and ending KE 2.55 J. My answer for the velocity was 0.23 m/s. Is this correct?

Thanks!

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# Homework Help: Energy Problem (IE and KE)

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