How do you find the initial speed?

  • Thread starter Hannah :)
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  • #1
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2586 kg van runs into the back of a 824 kg compact car at rest. They move off together at 8.5 m/s. Assuming the friction with the road can be negligible, find the initial speed of the van.

i dont even know where to start :/
 

Answers and Replies

  • #2
rock.freak667
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Since they are colliding, what quantity do you know is conserved in collisions?
 
  • #3
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umm i dont know?
 
  • #4
rock.freak667
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umm i dont know?

Do you know anything about what mass*velocity gives?
 
  • #5
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yea it gives momentum
 
  • #6
rock.freak667
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yea it gives momentum

So in a collision, is momentum conserved or not?
 

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