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60. (a) Let
m
1
be the mass of one sphere,
v
1
i
be its velocity before the collision, and
v
1
f
be
its velocity after the collision. Let
m
2
be the mass of the other sphere,
v
2
i
be its velocity
before the collision, and
v
2
f
be its velocity after the collision. Then, according to Eq.
975,
v
mm
v
m
v
fii
1
12
1
2
2
2
=
−
+
+
+
.
Suppose sphere 1 is originally traveling in the positive direction and is at rest after the
collision. Sphere 2 is originally traveling in the negative direction. Replace
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 Spring '08
 Any
 Physics, Mass

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