A bullet of mass m1 is fired with a speed v into the wooden bob of
a pendulum having mass m2. The bob is attached to a very light rigid
rod of length L that is pivoted at the other end.
The bullet is stopped in the bob. How high will the bob rise?
If the bullet has a mass of 5 g and the block has a mass of 400 g, how
fast was the bullet going if the block rises 15 cm?
