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A truck running at a speed …

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A truck running at a speed of 90 km/hr slows down to 54km/hr at the distance of 20m. Find the retardation caused by brakes and the time taken.

    • Posted by Jolie Mehra 5 years ago

    CBSE > Class 09 > Science
    • 1 answers

    Yogita Ingle 5 years ago

    54*5/18=15m/s

    v2-u2 =2as

    152-252=2*a*20

    225-625=2a*20

    2a=400/20

    2a=20

    a=20/2

    a=10m/s2

    v=u+at

    15=25-10t

    10t=25-15

    t=10/10

    t=1s

    0Thank You

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