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13 July, 03:55

A heavy object is dropped from a vertical height of 8.0 m. What is its speed when it hits the ground?

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  1. 13 July, 04:21
    0
    What do you know:

    d=-8.0mm (starts higher and ends lower so it is negative)

    Vi=0m/s (because it was dropped, not thrown)

    A=-9.8m/s^2 (gravity)

    Vf=?

    Use the equation:

    Vf^2=Vi^2+2A (d)

    Vf^2=2 (-9.8) (-8.0)

    Vf^2 = 156.8 - - >find the square root of this

    Final answer: Vf = 12.5m/s
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