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If a stone is thrown vertically upward from the surface of the moon with a velocity...

If a stone is thrown vertically upward from the surface of the moon with a velocity of 6 m/s, its height (in meters) after t seconds is h = 6t - 0.83t2. (Round the answers to two decimal places.)

a. What is the velocity of the stone after 3 s?

b. What is the velocity of the stone after it has risen 8 m?

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