Kinematics motion -- Dancers pausing at top of their leap 1. The problem statement, all variables and given/known data Ice skaters, ballet dancers, and basket ball players executing vertical leaps often give the illusion of "hanging" almost motionless near the top of the leap. To see why this is, consider a leap to maximum height, h. Of the total time spent in the air, what fraction is spent in the upper half (i.e., at y > 0.5h) 2. Relevant equations None 3. The attempt at a solution yf = yi + vit + 0.5gt^2 yf = 0 + vit + 0.5(-9.8ms^-2)t^2 yf = vit - 4.9ms^-2 t^2 Should I find the first derivative of yf and determine the local max? And what does upper half implies? The max time take for the object to travel from ground to max height?