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phizics09
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Homework Statement
The impulse on a human cannon ball is 2.5 103 N·s. The cannon
ball has a mass of 65 kg.
Homework Equations
How long is the barrel of the cannon if the cannon ball leaves the
cannon at 120 km/h?
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?