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10 March, 16:04

At a certain time a particle had a speed of 18 m/s in the positive x direction, and 2.4 s later its speed was 30 m/s in the opposite direction. What is the average acceleration of the particle during this 2.4 s interval?

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  1. 10 March, 17:17
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    Average acceleration of the particle during the 2.4 s interval is - 20 m/s²

    Explanation:

    We have equation of motion v = u + at

    Initial velocity, u = 18 m/s

    Final velocity, v = - 30 m/s

    Time, t = 2.4 s

    Substituting

    v = u + at

    -30 = 18 + a x 2.4

    a = - 20 m/s²

    Acceleration is - 20 m/s²

    Average acceleration of the particle during the 2.4 s interval is - 20 m/s²
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