99. We neglect air resistance, which justifies setting a= –g= –9.8 m/s2(taking downas the –ydirection) for the duration of the motion. We are allowed to use Table 2-1 (with ΔyreplacingΔx) because this is constant acceleration motion. When something is thrown straight up and is caught at the level it was thrown from (with a trajectory similar to that shown in Fig. 2-31), the time of flight tis half of its time of ascent ta, which is given by Eq. 2-18 with Δy= Hand v= 0 (indicating the maximum point).
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