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A grapefruit is tossed straight up with an initial velocity of 42 ft/sec. The grapefruit is 7 feet above the ground when it is released. Its height...

A grapefruit is tossed straight up with an initial velocity of 42 ft/sec. The grapefruit is 7 feet above the ground when it is released. Its height at time (t) is given by:

y = -16t^2 + 42t + 7

How high does it go before returning to the ground

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