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20 August, 08:29

A ball is thrown upwards with an initial velocity of 25. o m/s, what is the velocity of the ball at 11.9 m from the ground?

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  1. 20 August, 10:32
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    v2 = 19.79m/s

    Explanation:

    Okay, lets write down everything we have;

    v1 = 25m/s [up]

    v2 = ?

    d = 11.9 [up]

    a = 9.8 [down]

    So the formula we will use is v2^2 = v1^2 + 2ad. We also have to make acceleration negative, so everything can have the same direction of up:

    v2^2 = v1^2 + 2ad

    v2^2 = (25) ^2 + 2 (-9.8) (11.9)

    v2^2 = 625 - 233.24

    v2^2 = 391.76

    v2 = 19.79m/s
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