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22 February, 00:04

A ball is thrown horizontally from a cliff at a speed of 10 m/s. Calculate its speed one second later (be sure to show your math steps)

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  1. 22 February, 00:15
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    The ball is thrown horizontally at 10 m/s.

    Its horizontal speed doesn't change, but because of gravity,

    it picks up vertical (downward) speed at the rate of 9.8 m/s

    every second.

    So at the end of one second, the ball is moving ...

    horizontally at 10 m/s

    and

    downward at 9.8 m/s.

    All together, it's moving in kind of a slanted direction,

    at a speed of

    √ (10² + 9.8²)

    = √ (100 + 96.04)

    = √ (196.04) = 14 m/s (rounded)
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