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5 October, 15:18

A plant box falls from the windowsill 25.0 m above the sidewalk and hits the cement 3.0 s later. What is the box's velocity when it hits the ground?

24 m/s

22 m/s

120 m/s

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  1. 5 October, 15:44
    0
    22m/s

    Explanation:

    To find the velocity we employ the equation of free fall: v²=u²+2gh

    where u is initial velocity, g is acceleration due to gravity h is the height, v is the velocity the moment it hits the ground, taking the direction towards gravity as positive.

    Substituting for the values in the question we get:

    v²=2*9.8m/s²*25m

    v²=490m²/s²

    v=22.14m/s which can be approximated to 22m/s
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