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9 March, 12:50

A ball is thrown straight up from a bridge at a speed of 11.0 m/s. What will be its velocity (speed and direction) after 2.0 seconds?

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  1. 9 March, 13:14
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    Speed of ball after 2 seconds is 8.62 m/s downward.

    Explanation:

    Let upper direction be positive

    We have equation of motion v = u + at

    Initial velocity, u = 11 m/s

    Final velocity, v = ?

    Time, t = 2 s

    Acceleration, a = - 9.81 m/s²

    Substituting

    v = u + at

    v = 11 + - 9.81 x 2

    v = - 8.62 m/s

    Speed of ball after 2 seconds is 8.62 m/s downward.
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