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a ball rolls horizontally with a speed of 7.6 m/s off the edge of a tall platform. if the ball lands 8.7 m from the point on the ground directly below the edge of the platform, what is the height of the platform?

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  1. the horizontal speed never changes, so you can figure out how long it is in the air by distance = rate times time
    then figure out how far it fell in that amount of time starting with zero vertical velocity.

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