65. Let the mass of each ball be m. Conservation of (kinetic) energy in elastic collisions requires that
K
i
= K
f
which leads to
1
2
mV
2
=
1
2
(16m)v
2
which yields v = V /4.
65. Let the mass of each ball be m. Conservation of (kinetic) energy in elastic collisions requires that
K
i
= K
f
which leads to
1
2
mV
2
=
1
2
(16m)v
2
which yields v = V /4.