Work and Power- homework question

[Eric1]

I'm doing intro-physics and I'm stuck on this Q:

"In a human cannonball act in the circus, the barrel of a cannon is 3.05 meters long and 1070 J of work are used to accelerate the person. What is the force exerted on the person (in Newtons)?"

I know the formula for force is F=ma, but i feel like I'm missing something here.
Can anyone help me?

 

[FredGarvin]

$$P = \frac{w}{t} = \frac{f*d}{t}$$

Does that help?

 

[Eric1]

Thank you Fred.