7.67:
a) Taking
0
)
0
(
=
U
,
.
)
m
N
00
.
6
(
)
m
N
0
.
30
(
3
2
)
(
3
2
2
3
2
0
x
x
x
x
dx
F
x
U
x
x
+
=
+
=
=
∫
β
α
b)
,
J
75
.
27
)
)
m
50
.
0
)(
m
N
00
.
6
(
)
m
50
.
0
)(
m
N
0
.
30
((
)
)
m
00
.
1
)(
m
N
00
.
6
(
)
m
00
.
1
)(
m
N
0
.
30
((
3
2
2
3
2
2
2
1
2
=
+

+
=

=
U
U
K
and so
s
m
85
.
7
kg
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