2 Figure~P9.56 shows three points in the operation of the ballistic
3 pendulum discussed in Example 9.6 (and shown in Fig.~9.9b). The
4 projectile approaches the pendulum in Figure~P9.56a. Figure~P9.56b
5 shows the situation just after the projectile is captured in the
6 pendulum. In Figure~P9.56c, the pendulum arm has swung upward and
7 come to rest at a height $h$ above its initial position. \Part{a}
8 Prove that the ratio of kinetic energy of the projectile-pendulum
9 system immediately after the collision to the kenetic energy
10 immediately before is $m_1/(m_1+m_2)$. \Part{b} What is the ratio of
11 the momentum of the system immediately after the collision to the
12 momentum immediately before? \Part{c} A student believes that such a
13 large decrease in mechanical energy must be accompanied by at least a
14 small decrease in momentum. How would you convince this student of