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What is the difference between Vf=Vi+(a)t and Vf=Vi-gt in a freefall equation? Specifically i am confused...

What is the difference between Vf=Vi+(a)t and Vf=Vi-gt in a freefall equation? Specifically i am confused on this question :a tennis player tosses a tennis ball straight up and then catches it after 2.00 s at the same height as the point of release. (a) what is the acceleration of the ball while it is in flight? (b) what is the velocity of the ball when it reaches its maximum height? find (c) the initial velocity of the ball and (d) the maximum height it reaches

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