7. a ball rolls off a platform that is 7 meters above the ground. the

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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