A smart-phone is thrown upwards from the top of a 240-foot building with an initial velocity of 32 feet per second. The height h

Question

A smart-phone is thrown upwards from the top of a 240-foot building with an initial velocity of 32 feet per second. The height h of the smart-phone after t seconds is given by the quadratic equation h=16t² + 32t + 240. When will the smart-phone hit the ground?

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