A 50.0 g "bullet" is fired with an initial velocity of 5.40 m/s towards a ballistic pendulum with a mass of 220 g.

a. If the bullet sticks in the pendulum what is the velocity of the bullet + pendulum after the collision? [ Select ] ["1.59 m/s", "1.00 m/s", "4.40 m/s", "1.23 m/s"]

b. How much kinetic energy is lost in the collision?