A fast squirrel is running down a tree at a constant 4.0 m/s. It brushes an acorn with its tail
and knocks it loose. The acorn falls and eventually hits the squirrel's tail.
a. How far does the acorn fall before hitting the squirrel if it starts from rest?
b. If the acorn is knocked with an initial velocity of 1.5 m/s downward, how far does it fall
before hitting the squirrel?