7. A ball rolls off a platform that is 7 meters above the ground. The ball’s horizontal velocity as it…

7. A ball rolls off a platform that is 7 meters above the ground. The ball’s horizontal velocity as it leaves the platform is 4.2 m/s. (a) How much time does it take for the ball to hit the ground? (See the example box, use g = 10 m/s2.) s (b) How far from the base of the platform does the ball hit the ground? m

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