(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

The impulse on a human cannon ball is 2.5 103 N·s. The cannon

ball has a mass of 65 kg.

2. Relevant equations

How long is the barrel of the cannon if the cannon ball leaves the

cannon at 120 km/h?

3. The attempt at a solution

I used the formula J=ma(delta t)

(2.5x 10^3)=(65)(a)(0.2)

to find the acceleration. Then, I used the formula d=v1(t)+(1/2)(a)(t^2) to find the distance, and I got 3.85 m, but the answer at the back is wrong.

Can anybody help me?

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# Impulse on a Cannon Ball

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