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a rock is thrown vertically upward with a speed of 24m/s reaches height of 2+24t-4.9t^2 after t seconds.

a rock is thrown vertically upward with a speed of 24m/s reaches height of 2+24t-4.9t^2 after t seconds. how many seconds after the rock is thrown will it reach maximum height, and what is that height in meters? how many seconds after the rock is thrown will it reach the ground?

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