anonymous
  • anonymous
A 2,900-kg truck runs into the rear of a 1,000-kg car that was stationary. The truck and car are locked together after the collision and move with speed 5 m/s. What was the speed of the truck before the collision?
Physics
chestercat
  • chestercat
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anonymous
  • anonymous
Ok I get it this is a one dimensional collision
anonymous
  • anonymous
According to the laws of conservation of momentum all momentum is conserved no matter what
anonymous
  • anonymous
You have to calculate the momentum the first truck has before colliding onto the other vehicle. So 2900*v=3900*5 Where v is the veocity before the collision and righit side of the equation represents the total momentum after. But for the sake of simpicity let's leave the units out of our way

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anonymous
  • anonymous
You isolate the v and get the velocity before collision for the 2900 kg truck

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