a pebble is dropping from a building that is 125m high. THe pebble is initially at rest. approximately how long does it take for the pebble

Question

a pebble is dropping from a building that is 125m high. THe pebble is initially at rest. approximately how long does it take for the pebble to reach the ground.

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Diễm Thu 5 months 2021-08-29T12:45:54+00:00 1 Answers 1 views 0

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  1. sori
    0
    2021-08-29T12:47:49+00:00
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    Here’s the formula you want to use to solve this:

    Distance = (1/2) · (acceleration) · (time²)

    We know the distance to the ground and the acceleration of gravity, so let’s pluggum in:

    . . . . . 125 m = (1/2) (9.8 m/s²) (time²)

    Divide each side by (4.9 m/s²):  

    . . . . . (125 m) / (4.9 m/s²) = time²

    . . . . . 25.51 s² = time²

    Square-root each side:

    5.05 seconds  = time

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