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From a height of 100 m, a ball is thrown...

From a height of 100 m, a ball is thrown horizontally with an initial speed of `15 m//s`. How far does it travel horizontally in the first 2 seconds ?

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The question " How far does it travel horizontally .. ? " immediately tells us that we should use the first of the hoizontal-motion equations listed on the previous page.
` Delta x = v_(0_(x)) t = (15 m//s)(2 s)=30 m`
The information that the initial vertical position is 100 m above the ground is irrelevant (except for the fact that it's high enough that the ball won't strike the ground before the 2 seconds have elapsed).
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