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Problem 2 (6points) You are standing on a cart with frictionless wheels which is

ID: 1738958 • Letter: P

Question

Problem 2 (6points)

You are standing on a cart with frictionless wheels which is atrest. At to you throw a ball to the left, withmomentum p, at a wall that is attached to the cart. Att1 the ball bounces off the wall, as shown, with thesame momentum.
What happens to the cart between to andt1?

At time t2 you catch the ball. What happens tothe cart between t1 and t2?


What happens to the cart after time t2?



  • The cart moves to the right with momentum 2p
  • The cart moves to the right with momentum p
  • The cart stays put / stops
  • The cart moves to the left with momentum p
  • The cart moves to the left with momentum 2p

At time t2 you catch the ball. What happens tothe cart between t1 and t2?


  • The cart moves to the right with momentum 2p
  • The cart moves to the right with momentum p
  • The cart stays put / stops
  • The cart moves to the left with momentum p
  • The cart moves to the left with momentum 2p

What happens to the cart after time t2?

  • The cart moves to the right with momentum 2p
  • The cart moves to the right with momentum p
  • The cart stays put / stops
  • The cart moves to the left with momentum p
  • The cart moves to the left with momentum 2p


Explanation / Answer

The total momentum of the system is always zero Pball + Pcart = 0 t < t1 ball moves to left with momentum Pand cart moves to right with momentum P t1 < t < t2   ball movesto right with momentum P and cart moves to left with momentumP t2 < t       balland cart are motionless
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