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**1. Homework Statement**

You are in charge of a cannon that exerts a force 11200 N on a cannon ball while the ball is in the barrel of the cannon. The length of the cannon barrel is 2.18 m and the cannon is aimed at a 37.9 ◦ angle from the ground. The acceleration of gravity is 9.8 m/s 2 . If you want the ball to leave the cannon with speed v0 = 78.4 m/s, what mass cannon ball must you use? Answer in units of kg.

**2. Homework Equations**

KE=(1/2)mv^2

W=F*displacement*cos(theta)

**3. The Attempt at a Solution**

Used the kinetic energy equation to solve for mass

Then, used the second equation to find work.

I do not know how to get work to kinetic energy to plug into the mass solved equation.