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6.67:
a)
.
N
00
.
4
)
m
00
.
1
)(
m
N
00
.
4
(
3
3
3
=
=
α
a
x
b)
.
N
0
.
32
)
m
00
.
2
)(
m
N
00
.
4
(
3
3
3
=
=
α
b
x
c) Equation 6.7 gives the work needed to
move an object against the force; the work done by the force is the negative of this,

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