Projectile Launch Speed: Solve 876j Work Homework

[Chica1975]

Homework Statement

A projectile launcher did 876j of work on a .398kg projectile what is the launch speed of the projectile?

Homework Equations

W = f*d
mg = 3.9004
after that I am stuck

The Attempt at a Solution

I drew a diagram and tried a few things but am completely stuck. please help.

 

[rock.freak667]

The Attempt at a Solution

I drew a diagram and tried a few things but am completely stuck. please help.

The work done is entirely kinetic

 

[Chica1975]

thanks I will look it up and try again.

 

[fuzzywolf]

W = F * d is only a mathematical tool to calculate how much work is done. The applicable statement of physics is W = $$\Delta$$E