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A Rock Is Thrown Straight Up With An Initial Velocity Of 24.5 M/s. What Time Interval Elapses Between The Rock's Being Thrown And Its Return To The Original Launch Point? (Acceleration Due To Gravity Is 9.80 M/s2.) - Math Discussion

A rock is thrown straight up with an initial velocity of 24.5 m/s. What time interval elapses between the rock's being thrown and its return to the original launch point? (Acceleration due to gravity is 9.80 m/s2.)