how long does it take to fall 20m? 4.9t^2 = 20
Now, use that t to find the horizontal speed, since
speed = distance/time
A target lies flat on the ground 8 m from the side of a cliff that is 20 m tall. A physics student rolls a ball off the horizontal cliff in the direction of the target. Air resistance is negligible. Determine the horizontal speed with which the ball must leave the top of the cliff if it is to strike the target.
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