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A car travels 20m /sec along …

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A car travels 20m /sec along a road a child runs out into the road 50m ahead the car driver stop the pedal what must the declaration be if the car is stop just before it reach the child

    • Posted by Srihaan Chandra 4 years, 4 months ago

    CBSE > Class 09 > Science
    • 1 answers

    Sia ? 4 years, 4 months ago

    Initial velocity, u=20m/s
    Final velocity, v=0m/s
    Distance, s=50m

    Using relation, v2 = u2 + 2as
    02 = (20)2 + 2 × a × 50
    02 = 400 + 100a
    −400 = 100a

    a = −400 / 100 ​= −4m/s2
    The car's deceleration must be 4m/s2.

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