ch02-p059 - 59. We neglect air resistance, which justifies...

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59. 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. The ground level is taken to correspond to the origin of the y axis. (a) The time drop 1 leaves the nozzle is taken as t = 0 and its time of landing on the floor t 1 can be computed from Eq. 2-15, with v 0 = 0 and y 1 = –2.00 m. 2 11 1 2 1 2 2( 2.00 m) 0.639 s . 29 . 8 m / s y yg t t g −− =− ¡ == = At that moment, the fourth drop begins to fall, and from the regularity of the dripping we conclude that drop 2 leaves the nozzle at
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