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Velocity of the ball is $\"\"$ ft/s.

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Height $\"\"$ .

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The velocity $\"\"$ at time $\"\"$ : $\"\"$ .

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$\"\"$

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Velocity function : $\"\"$ .

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Find the velocity at time $\"\"$ .

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Substitute $\"\"$ in velocity function. \ \

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$\"\"$

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The velocity at time $\"\"$ is $\"\"$ ft/s.

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The velocity at time $\"\"$ is $\"\"$ ft/s.