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    SketchyHolly's Avatar
    SketchyHolly Posts: 1, Reputation: 1
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    #1

    Oct 18, 2011, 04:14 PM
    How to find acceleration?
    A 2.4 ton truck provides an acceleration of 2.6 ft/s^2 to a 6.4 ton trailer. If the truck exerts the same force on the road while pulling a 6.9 trailer, what acceleration results?

    I used the formula F=m/a
    I took 2.6*6.4= 16.64, made that equal to 6.9a, and solved for a, but it wasn't right:/
    ebaines's Avatar
    ebaines Posts: 12,131, Reputation: 1307
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    #2

    Oct 19, 2011, 05:49 AM
    1. The correct equation is F=ma, not F=m/a.
    2. You're on the right track, except you forgot about the truck's mass. The total mass being accelerated includes both the truck and the trailer. So you have:

    (2.4+6.4) x 2.6 = (2.4+6.9) x a

    Now solve for a.
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