Two balls of known masses hang from the ceiling on massless strings of equal length. They barely touch when both hang at rest. One ball is pulled back until its string is at 45 ∘, then released. It swings down, collides with the second ball, and they stick together. The problem can be divided into three parts: (1) from when the first ball is released and to just before it hits the stationary ball, (2) the two balls collide, and (3) the two balls swing up together just after the collision to their highest point. conserved in parts (1) and (3) as the balls swing like pendulums. During the collision in part (2) conserved as the collision is Explain. Match the words in the left column to the appropriate blanks in the sentences on the rightboth energy and momentum areonly energy is only momentum isboth energy and momentum are only energy is only momentum iselasticinelastic