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ch02-p049 - 49 We neglect air resistance which justifies...

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49. 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 motion. We are allowed to use Table 2-1 (with Δ y replacing Δ x ) because this is constant acceleration motion. We are placing the coordinate origin on the ground. We note that the initial velocity of the package is the same as the velocity of the balloon, v 0 = +12 m/s and that its initial coordinate is y 0 = +80 m. (a) We solve yy v t g t =+ 00 1 2 2 for time, with
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