v = Vi -9.81 t v = 0 at top at 2 s so Vi = 9.81 * 2 = 19.6 m/s at takeoff h = Vi t -4.9 t^2 = 19.6 * 2 - 4.9 * 4 = 39.2 - 19.6 = 19.6 meters at peak
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