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25 July, 05:51

You throw a rock horizontally off a cliff with a speed of 20 m/s. after two seconds, the magnitude of the velocity of the rock is closest to

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  1. 25 July, 07:44
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    So the magnitude of the resultant vector of the vertical and horizontal together is a right triangle with 20 on one side and 19.62 going down.

    A^2 + B^2 = C^2

    20^2 + 19.62^2 = C^2

    400 + 385 = C^2

    C = 28.0 m/s magnitude
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