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  1. A car accelerates uniformly from 18 kmph to 72 kmph in 5 s. The acceleration of the car (in m/s2) is:

    2. A.

     3
    B.

     5
    C.

     6
    D.

     7

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    Answer : Option A

    Explanation :

    Initial speed = u = 18 km/hr = 5 m/s
    Final speed = v = 72 km/hr = 20 m/s
    acceleration a = (v-u)/t = (20 - 5)/5 = 3 m/s2.

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