Posted by Jeon on Friday, August 26, 2011 at 9:51pm.
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?

physics  drwls, Friday, August 26, 2011 at 11:25pm
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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