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20 August, 21:26

A jet plane lands with a speed of 87 m/s and can accelerate at a maximum rate of - 4.10 m/s2 as it comes to rest. (a) From the instant the plane touches the runway, what is the minimum time needed before it can come to rest?

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  1. 20 August, 21:48
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    21.22s

    Explanation:

    initial velocity u=87m/s

    acceleration a=-4.10 m/s²

    velocity v=0

    time t=?

    From Newton's first law of motion

    V=u+at

    0=87-4.10t

    -87=-4.1t

    t = - 87/-4.1

    t = 21.22 s
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