Physics

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A 90 kg halfback runs north and is tackled by a 120 kg opponent running south at 4 m/s. The collision is perfectly inelastic. Just after the tackle, both players move at a velocity of 2 m/s north. Calculate the velocity of the 90 kg player just before the tackle.

a.) 3 m/s south
b.) 4 m/s south
c.) 10 m/s north
d.) 12 m/s north

  • Physics -

    Given

    mA = 90 kg
    MAf = 2 m/s

    mB = 120 kg
    MAi = 4 m/s
    MAf = 2 m/s

    Use the equation:::

    (MA)(VAf) + (MB) (VBf) = (MA)(VAi) + (MB)(MBi)

    If you have any questions, just reply back.

  • Physics -

    north momentums:

    before
    90 v - 120 * 4

    after
    (90+120) * 2

    set those equal and solve for v

  • Physics -

    10m/s

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