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13 April, 16:40

A 2000kg car experiences a braking force of 10000N and skids to a stop in 6 seconds. The speed of the car just before the brakes were applied was

A) 45 m/s

B) 15 m/s

C) 1.2 m/s

D) 30 m/s

E) none of these

So far I got a = 5m/s^2 and u = 30m/s but I think the answer is 45 m/s but I do not know where to go from there.

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  1. 13 April, 20:37
    0
    D. 30m/s

    Explanation:

    According to the equation of motion

    v=u + at

    v = Final velocity

    u = initial velocity

    a = acceleration

    t = time taken

    Since we don't know the acceleration of the body, we will find its acceleration using newtons first law of motion F = ma

    10000 = 2000a

    a = 5m/s²

    initial velocity = 0m/s since the body starts from rest

    v is what we are looking for

    t = 6seconds

    Substituting this datas in the formula

    v = 0 + 5 (6)

    v = 30m/s (D)
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