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Fernando tosses a ball upwards with an initial velocity of 12.0 m/s. What is in meters/second the velocity of the ball 4.5 seconds after he threw it?

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Subtract g*t from the initial (positive) vertical velocity.

t = 4.5 s, and g is the acceleration of gravity, which you should know the value of.

That will give you a negative number, meaning the velocity will be downwards at that time.

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