Physics 11 problem 19

  • Thread starter Iceclover
  • Start date
  • #1
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Homework Statement


a 2575-kg van runs into the back of a 825-kg compact car at rest. they move off together at 8.5m/s. assuming no friction with the ground, find the initial speed of the van
 

Answers and Replies

  • #2
EP
76
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Write out conservation of momentum equation. The momuentum of the system before the collision on one side and the momentum of the entire system after the collision on the other.
 
  • #3
59
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how do i do that
 
  • #4
EP
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see other problem
 
  • #5
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how do i find out the momentum before the collision when i only have a velocity for after the collision?
 
  • #6
EP
76
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write out the equation like in the last problem. Fortunately that is your only unknown.
 
  • #7
59
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i got 11.2 m/s
 
  • #8
EP
76
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Good work!
 

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