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    Conservation Linear Momentum (? Book Error ?)

    Ok, don't ask why I was doing this dynamics problem from an old text book, but, I cannot get the answer to match that in the back of book and it's a simple problem. Here it is, a cannon weighing 400 lb, fired a cannon ball weighing 10 lb, and had a muzzle velocity of 200 ft/s. For a 10...
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