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Calculating thickness of ice? X^3+4x=4+x^2 simplify i got stuck? An athlete running 2.6 m/s increases his velocity to 3.7 m/s in 2.7 s. What is the acceleration of the runner? Calculate the equilibrium constant K of the reaction? A girl on a bridge throws a rock straight down at -12.5 m/s. It hits the ground 38.4 m below. How much time did it take ? Please help !?