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6.72:
In Eq. (6.14),
dx
dl
=
and
°
=
0
.
31
φ
is constant, and so
.
J
39
.
3
0
.
31
cos
)
m
/
N
00
.
5
(
cos
cos
m
50
.
1
m
00
.
1
2
2
2
1
2
1
∫
∫
∫
=
°
=
=
=
dx
x
dx
F
dl
F
W
P
P
x
x
The final speed of the object is then

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