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22
2
00
11
(
sin
)
(25.0 m/s)sin 40.0 (1.15 s)
(9.80 m/s )(1.15 s)
12.0 m.
yv
t
g
t
θ
Δ=
−
=
°
−
=
(b) The horizontal component of the velocity when it strikes the wall does not change
from its initial value:
v
x
=
v
0
cos 40.0° = 19.2 m/s.
(c) The vertical component becomes (using Eq. 423)
2
sin
(25.0 m/s) sin 40.0
(9.80 m/s )(1.15 s) 4.80 m/s.
y
vv
g
t
=−
=
°
−
=
(d) Since
v
y
> 0 when the ball hits the wall, it has not reached the highest point yet.
38. We adopt the positive direction choices used in the textbook so that equations such as
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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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