Fig. 6

Time variation in velocity and height with respect to time variation in acceleration under two waist conditions. Velocity at takeoff (\(h=0.7\) m) is greater in Condition 1 than in Condition 2. Condition 1(Blue line): \(\ddot{y}\mathrm{{w}}\left( t\right)\) is large at large t Condition 2(Red line): \(\ddot{y}\mathrm{{w}}\left( t\right)\) is large at small t