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

a student wearing a frictionless in-line skates on a horizontal surface is pushed by a friend with a constant force of 45N. How far must the student be pushed, starting from rest, so that her final kinetic energy is 352J?

2. Relevant equations

3. The attempt at a solution

KE=1/2MV^2

352=1/2*(45/9.81)*V^2

Vf=12.39 and Vi=0 since it starts from rest

Wnet=1/2MVf^2-1/2MVi^2

1/2*(45/9.81)*12.39^2=352.31

Wnet=FnetDCosX

352.31=45dcos0

d=7.83m

I just wanted to know if that was a correct way of solving it or did i make a mistake somewhere?

thx for the help.

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Mistake in solving for work in physics?

**Physics Forums | Science Articles, Homework Help, Discussion**