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physical science

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a track and field athlete is running forward with a javelin at a velocity of 4.2 m/s. If he throws the javelin at a velocity relative to him of 10.3 m/s,then what is the velocity of the javelin relative to the ground?

please help quick!!
thanks :)

  • physical science - ,

    10.3 + 4.2 = ___ m/s

    Do the addition.

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