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Work done on crate by the truck

  • Thread starter waldvocm
  • Start date
  • #1
76
0
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?
 

Answers and Replies

  • #2
954
117
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.
 
  • #3
76
0
opps! W=9481J Final answer!

Was I correct in choosing W=Kf-Ki for my equation in this problem?????
 
  • #4
954
117
Was I correct in choosing W=Kf-Ki for my equation in this problem?????
Yes. Work done by an external force on a system increases the energy of the system.
 

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