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97. Since we will be taking the vector cross product in the course of our calculations,
below, we note first that when the two vectors in a cross product
G
G
A
B
×
are in the
xy
plane, we have
G
AA A
xy
=
##
i +
j and
G
BB B
=
i +
j, and Eq. 330 leads to
G
G
AB AB AB
yx
×=
−
di
#
k.
Now, we choose coordinates centered on point
O
, with +
x
rightwards and +
y
upwards. In
unitvector notation, the initial position of the particle, then, is
G
rs
0
=
#
i and its later
position (halfway to the ground) is
G
rs h
=−
ij
1
2
. Using either the freefall equations of
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 Spring '08
 Any
 Physics

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