Imagine You Throw a Tennis Ball Vertically into the Air $9.8 \mathrm{~m} / \mathrm{s}^{2}$

Multiple Choice

Imagine you throw a tennis ball vertically into the air. At the exact top of its trajectory it is at rest. What is the magnitude of its acceleration at this point?

A) $9.8 \mathrm{~m} / \mathrm{s}^{2}$
B) $-9.8 \mathrm{~m} / \mathrm{s}^{2}$
C) $0<|\vec{a}|<9.8 \mathrm{~m} / \mathrm{s}^{2}$
D) 0
E) Other (specify)