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11 February, 22:43

A ball is thrown vertically upwards at 19.6 m/s. for its complete trip (up and back down to the starting position), its average velocity is

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  1. 12 February, 01:25
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    The average velocity of an object is given by:

    Average velocity = total displacement / total time

    First, we calculate the time taken to reach the maximum height of the ball. This occurs when the final velocity is 0.

    Vf = Vi + at

    0 = 19.6 - 9.81 * t

    t = 2 seconds

    The total trip will be of 4 seconds (2 seconds up, 2 seconds down)

    The total displacement is given by:

    s = ut + 1/2 * at²

    s = 19.6 * 2 - 0.5 * 9.81 * 2²

    s = 19.6 meters

    This is the distance maximum height, so the total height is

    19.6 * 2 = 39.2 meters

    Average velocity = 39.2 / 4

    Average velocity = 9.8 m/s
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