# Homework Help: Kinetic energy question

1. Mar 19, 2014

### dasher141

1. The problem statement, all variables and given/known data
I don't know how to solve this question.

28.8J of work were done in accelerating a mall of 1.8 kg from rest. Find its final velocity. I'm not sure which formula to use..

2. Relevant equations
F=ma
W=Fs
KE=1/2 mv^2

3. The attempt at a solution
I can't figure out which formula to use. (did some working in my workbook)

2. Mar 19, 2014

### Staff: Mentor

Hi dasher141. http://img96.imageshack.us/img96/5725/red5e5etimes5e5e45e5e25.gif [Broken]

Work and Energy have the same units, so are basically the same thing. I like the formula "work done = change in kinetic energy"

Last edited by a moderator: May 6, 2017
3. Mar 19, 2014

### dimasamsonov90

A=Wk2-Wk1, Wk1=0 →
→ A=Wk1=mV2/2 → V=$\sqrt{}(2A/m)$

4. Mar 21, 2014

### dimasamsonov90

Sorry, made a mistake in second line. A=Wk2