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62. (a) Let
m
A
be the mass of the block on the left,
v
A
i
be its initial velocity, and
v
A
f
be its
final velocity. Let
m
B
be the mass of the block on the right,
v
B
i
be its initial velocity, and
v
B
f
be its final velocity. The momentum of the twoblock system is conserved, so
m
A
v
A
i
+
m
B
v
B
i
=
m
A
v
A
f
+
m
B
v
B
f
and
(1.6 kg)(5.5m/s) (2.4 kg)(2.5m/s) (2.4 kg)(4.9 m/s)
1.6kg
1.9 m/s.
AA
i
BB
i
f
Af
A
mv
v
m
+−
==
=
(b) The block continues going to the right after the collision.
(c) To see if the collision is elastic, we compare the total kinetic energy before the
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 Spring '08
 Any
 Physics, Mass, Momentum

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