A car accelerates from rest at 7.2 m/s 2 . How much time does it need to attain a speed of 4 m/s? Answer in units of s.

Question

A car accelerates from rest at 7.2 m/s 2 . How much time does it need to attain a speed of 4 m/s? Answer in units of s.

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Bình An 5 years 2021-07-14T04:33:09+00:00 1 Answers 10 views 0

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  1. linhdan
    0
    2021-07-14T04:34:48+00:00
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    Answer:

    The time is 0.6 sec.

    Explanation:

    Given that,

    Acceleration of car = 7.2 m/s²

    Speed = 4 m/s

    We need to calculate the time

    Using equation of motion

    v=u+at

    Where, u = initial velocity

    v = final velocity

    a = acceleration

    t = time

    Put the value in the equation

    4=0+7.2\times t

    t=\dfrac{4}{7.2}

    t=0.6\ sec

    Hence, The time is 0.6 sec.

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