The x-component of the projectile's acceleration at the top of its path zero the y-component of the projectile's acceleration at the top of its path the x-component of the projectile's velocity half way back down from the max height positive the y-component of the projectile's negative velocity half way back down from the max height the x-component of the projectile's acceleration half way back down from poste the max hcight the y-component of the projectile acceleration half way back down from the max hcight negative