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12 April, 04:07

E. A racing car has a mass of 710kg. It starts from rest and travels 120m in

3.0s. The car undergoes uniform acceleration during the entire 3.0s.

What is the unbalanced force applied to the car?

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Answers (1)
  1. 12 April, 04:08
    0
    6300

    N

    Explanation:

    We will employ the following equation of kinematics

    x

    =

    1

    2

    a

    t

    2

    which describes an object traveling in one dimension with a constant acceleration and an initial velocity of zero.

    We know the displacement and the time elapsed so we may solve for the acceleration:

    40.0

    m

    =

    1

    2

    a

    (

    3.0

    s

    )

    2

    Solving for

    a

    yields:

    a

    =

    8.89

    m

    s

    2

    Now, knowing the acceleration of the car as well as the mass of the car we can apply Newton's second law, which states

    F

    net

    =

    m

    a

    All we need to do is plug in our values for

    m

    and

    a

    :

    F

    net

    =

    710

    kg



    8.89

    m

    s

    2

    =

    6311.9

    N

    Considering the fact that our final answer should have only two significant digits, we will round to the nearest hundred:

    F

    net
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