Imagine You Serve a Tennis Ball with an Initial Speed $10 \mathrm{~m} / \mathrm{s}$

Imagine you serve a tennis ball with an initial speed of $10 \mathrm{~m} / \mathrm{s}$ in a direction $10^{\circ}$ below the horizontal. What is its speed at the peak of its trajectory?

A) $10 \mathrm{~m} / \mathrm{s}$
B) $9.8 \mathrm{~m} / \mathrm{s}$
C) $1.7 \mathrm{~m} / \mathrm{s}$
D) $0 \mathrm{~m} / \mathrm{s}$
E) There is no "peak" to this tennis ball's trajectory.
F) Other (specify)