# ch02-p044 - 44 Neglect of air resistance justifies setting...

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44. Neglect of air resistance justifies setting a = – g = –9.8 m/s 2 (where down is our – y direction) for the duration of the fall. This is constant acceleration motion, and we may use Table 2-1 (with Δ y replacing Δ x ). (a) Using Eq. 2-16 and taking the negative root (since the final velocity is downward), we have 2 2 0 2 0 2(9.8 m/s )( 1700 m) 183 m/s v v g y = − Δ = − = − . Its magnitude is therefore 183 m/s. (b) No, but it is hard to make a convincing case without more analysis. We estimate the
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