if a piece of wood dropped from a tall building has reached a velocity of 68.6m/s for how long has it been falling

Question

if a piece of wood dropped from a tall building has reached a velocity of 68.6m/s for how long has it been falling

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Kim Chi 3 days 2021-07-19T20:38:00+00:00 1 Answers 1 views 0

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    2021-07-19T20:39:25+00:00

    Given that,

    Let initial speed of the piece of wood, u = 0

    Finally, it reaches to a speed of 68.6 m/s. It will be its final velocity. We need to find the time taken by it to fall. Using equation of motion as :

    v=u+at

    a = g

    v=gt\\\\t=\dfrac{v}{g}\\\\t=\dfrac{68.6}{9.8}\\\\t=7\ s

    So, it will taken 7 seconds to fall. Hence, this is the required solution.

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