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Work done on crate by the truck

  1. Nov 30, 2009 #1
    A truck carrying a 65.4kg crate accelerates from rest to 61.3km/hr on a flat horizontal surface in 15.2s The acceleration was not constant. HOw much work was done on the crate by the truck?

    W=Kf-Ki

    W=(1/2*65.4kg*220680000^2)-0

    W=1.59e18

    Is this correct?
     
  2. jcsd
  3. Nov 30, 2009 #2
    Wow that's a very very fast truck. It's travelling at 0.7c!
    Check your conversion of km/h to m/s again (I do have somewhat of an idea how you got that value). In any case, checking the order of magnitude of your answer often yields insights into possible careless errors in the working process.
     
  4. Nov 30, 2009 #3
    opps! W=9481J Final answer!

    Was I correct in choosing W=Kf-Ki for my equation in this problem?????
     
  5. Nov 30, 2009 #4
    Yes. Work done by an external force on a system increases the energy of the system.
     
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