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v
yg
t
t
y
0
2
1
2
15
1
2
98
45
217
=
+
=
−+
=
(.
(
.
)
(
.
.
.
m)
m / s
s)
s
m/s.
22
The magnitude of the initial velocity is
vv
v
xy
00
2
0
2
10 2
24
=+
=
+
=
m/s)
(b) The initial angle satisfies tan
θ
0
=
v
0
y
/
v
0
x
. Thus,
0
= tan
–1
[(21.7 m/s)/(10.2 m/s) ]=
65°.
101. We adopt the positive direction choices used in the textbook so that equations such
as Eq. 422 are directly applicable. The coordinate origin is at the initial position for the
football as it begins projectile motion in the sense of §45), and we let
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This note was uploaded on 05/17/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.
 Spring '08
 Any
 Physics, Projectile Motion

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