physics

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A 1000 kg car is rolling down the street at 2.5 m/s. How fast would a 2500 kg car have to collide into it in order to bring it to rest (0 m/s)?

  • physics -

    initial momentum = 1000*2.5 + 2500 * v = final momentum = 0

    v = - 2500/2500 = -1 m/s

  • physics -

    Use momentum conservation and assume the cars stick together.
    1000*2.5 - (2500)*V = 0
    V = 1.0 m/s

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