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Classical Mechanics

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Free-Fall Acceleration: Initial Velocity of a Ball

CLMECH-6M2PJQ

A child is tossing a ball vertically upwards into the air. $0.81\:s$ after the child tosses the ball, the ball has a velocity of $-2.4\:m/s$.

What was the initial velocity of the ball in $m/s$? Ignore air resistance.