Calculating Final Velocity with Given Work and Mass

[dasher141]

Homework Statement

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..

Homework Equations

F=ma
W=Fs
KE=1/2 mv^2

The Attempt at a Solution

I can't figure out which formula to use. (did some working in my workbook)

 

[NascentOxygen]

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

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

 

[dimasamsonov90]

A=W_k2-W_k1, W_k1=0 →
→ A=W_k1=mV²/2 → V=$\sqrt{}(2A/m)$

 

[dimasamsonov90]

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