49. 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. 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, v0= +12 m/s and that its initial coordinate is y0= +80 m. (a) We solve yy vt gt=+−00122for time, with
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