For a projectile launched horizontally, which of the following best describes the vertical component of a projectile's velocity? Assume air resistance is negligible.
a) The vertical component of the projectile's velocity initially decreases and then increases.
b)The vertical component of the projectile's velocity is zero.
c) The vertical component of the projectile's velocity remains a nonzero constant.
d)The vertical component of the projectile's velocity continually increases.
e)The vertical component of the projectile's velocity continually decreases.