Physics

Two golf carts are driving towards each other. The first has a mass of 390 kg and is driving east at 20 m/s. The second has a mass of 500 kg and is driving west at 8 m/s. When the two collide their bumpers lock and are stuck together, what is the final speed of the connected golf carts? ( Note: In this problem consider east to be a positive direction and west to be a negative direction.)

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asked by Kevin
  1. Initial momentum
    390*20 - 500*8 = 3800 , x direction

    Final momentum = (390 + 500)v
    = 890 v , x direction

    But we all know from the first law deduced by Isaac Newton that since there are no external forces on this system in the x direction there will be no change in x momentum.
    therefore:
    890 v = 3800
    v = 4.27 m/s , x direction (East)

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    posted by Damon

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