when a car travel at a speed of 60km/he applies brake it comes to rest in 15s then the retardation of the car is​

Question

when a car travel at a speed of 60km/he applies brake it comes to rest in 15s then the retardation of the car is​

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Josie 1 month 2021-08-16T21:43:12+00:00 2 Answers 0 views 0

Answers ( )

    0
    2021-08-16T21:44:36+00:00

    ANSWER:

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    Given:

    • Intial velocity of the car (u) = \bf{60km/hr}

    \bf{\implies{16.67 m/s^2}}

    Final velocity (v) = \bf{0 m/s}

    Time = \bf{15s}

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    SOLUTION:-

    We know:-

    \boxed{\bf{v = u + at}}

    • Putting the values:-

    0 = 16.67 + a[15]

    0 = 16.67 + 15a

    15 a = -16.67

    a = {\bf{\frac{-16.67}{15}}}

    a = - 1.11133 m/s^2

    \implies{\bf{-1.12 \: m/s^2}}

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    Therefore, the Retardation of the car is:

    \bf{- 1.12 m/s^2}

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    0
    2021-08-16T21:44:38+00:00

    Initial velocity of the car (u) = 60km/hr^2 = 16.67 m/s^2

    Final velocity (v) = 0 m/s

    Time = 15s

    ________________________

    Use this equation

    v = u + at

    0 = 16.67 + a(15)

    15 a = -16.67

    15 will shift

    Divide it

    a = - 1.12 m/s^2

    The retardation of the car = - 1.12 m/s^2

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