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a ball is propelled vertically upward with initial velocity as 15meter/seconds. distance is set up as...

a ball is propelled vertically upward with initial velocity as 15meter/seconds. distance is set up as s(t)=15t-4.9t^2. When will the object be 5 meters above the ground, when will it strike the ground, and will the object reach a height of 90 meters? Please include all work thank ylu so much in advance!

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