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12
21
2
1
1
2
(/ )(/)
aa
FF
a
m m
Fa
a a
==
=
++
+
which yields
a
= 2.6 m/s
2
.
79. The “certain force” denoted
F
is assumed to be the net force on the object when it
gives
m
1
an acceleration
a
1
= 12 m/s
2
and when it gives
m
2
an acceleration
a
2
= 3.3 m/s
2
.
Thus, we substitute
m
1
=
F
/
a
1
and
m
2
=
F
/
a
2
in appropriate places during the following
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 Spring '08
 Any
 Physics, Acceleration, Force

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