An Object Falling Vertically at a Speed Of $20 \mathrm{~m} / \mathrm{s}$

Multiple Choice

An object falling vertically at a speed of $20 \mathrm{~m} / \mathrm{s}$ lands in a snowbank and comes to rest $0.5 \mathrm{~s}$ later. The object's average acceleration during this interval is

A) Upward
B) Downward
C) Zero