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20 August, 10:33

A 5 N force is applied to a 3 kg ball to change its velocity from 9 m/s to 3 m/s. What is the impulse on the ball?

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  1. 20 August, 10:51
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    So, first the formula of Impulse is

    I = force * time

    We have force but no time.

    Then, find time.

    Next find acceleration,

    F = mass * acceleration

    5 = 3 * a

    1.67 m/s^2

    Next find time,

    Acceleration = change in velocity / time

    Change in velocity is velocity final - velocity initial

    1.67 = 3 - 9 / time

    Time = 3.6 s (round to 2 s. f.)

    Lastly,

    Impulse = force * time

    Impulse = 5 * 3.6

    Impulse is 18 Ns
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