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(c) The
x
component of velocity does not change:
v
x
=
v
0
= 1.00
×
10
9
cm/s = 1.00
×
10
7
m/s.
(d) The
y
component of the velocity is
()
(
)
17
2
9
8
6
1.00 10 cm/s
2.00 10 s
2.00 10 cm/s
2.00 10 m/s.
yy
va
t
−
==
×
×
=
×
=
×
113. Since this problem involves constant downward acceleration of magnitude
a
, similar
to the projectile motion situation, we use the equations of
§46 as long as we substitute
a
for
g
. We adopt the positive direction choices used in the textbook so that equations such
as Eq. 422 are directly applicable. The initial velocity is horizontal so that
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 Spring '08
 Any
 Physics, Acceleration, Projectile Motion

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