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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 21 (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. 215, 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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 Spring '06
 Stoler
 Physics, Resistance, Acceleration

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