t
y
g
==
=
22
4
5
303
(
.
m)
9.8 m / s
s.
2
Therefore, the speed of the boat is
v
b
12
40
m
3.03 s
m/s .
.
51. The speed of the boat is constant, given by
v
b
=
d
/
t
. Here,
d
is the distance of the boat
from the bridge when the key is dropped (12 m) and
t
is the time the key takes in falling.
To calculate
t
, we put the origin of the coordinate system at the point where the key is
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 Spring '06
 Stoler
 Physics, initial velocity, downward direction

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