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physics

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Reckless Rick driving along the road at 90 km/hr bumps into Hapless Harry directly in fornt of him who is driving at 88 km/hr. What is the speed of the collision?

  • physics -

    m1•v1+m1•v2=(m1+m2)•v

  • physics -

    7920

  • physics -

    20km

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