ch02-p046 - 46. We neglect air resistance, which justifies...

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46. We neglect air resistance, which justifies setting a = – g = –9.8 m/s 2 (taking down as the – y direction) for the duration of the fall. This is constant acceleration motion, which justifies the use of Table 2-1 (with Δ y replacing Δ x ). (a) Noting that Δ y = y y 0 = –30 m, we apply Eq. 2-15 and the quadratic formula (Appendix E) to compute t : Δ Δ yv t g t t vvg y g =− ¡ = ±− 0 2 00 2 1 2 2 which (with v 0 = –12 m/s since it is downward) leads, upon choosing the positive root (so that t
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