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27 September, 21:09

If a small rock is dropped from a height of 3.1 m how fast will it be moving when it reaches the ground 0.80 seconds later

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  1. 27 September, 21:30
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    X=1/2 at^2

    3.1=1/2 a * 0.64

    a=9.68

    v=at

    v=0.8*9.6875=7.75
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