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5 December, 05:47

You drop a 30 g pebble down a well. You hear a splash 2.7 s later. What was the pebble's speed just as it reaches the water? Assume g = 9.8 m/s2

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  1. 5 December, 09:01
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    vf=vi+at

    No need for rearranging because it is already set up for Vf (final velocity)

    a = - 9.8m/s² (because it is falling)

    vi = 0

    t = 2.7

    0 + - 9.8 (2.7) = vf

    vf = - 26.5 (-26.46)
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