Hello, I am just very confused on this topic in general, would appreciate to help get the answers for these. Thank you in advance!

For general projectile motion, when the projectile is at the highest point of its trajectory, its acceleration is zero? a)the horizontal and vertical components of its velocity are zero. b) its velocity is perpendicular to the acceleration. c)the horizontal component of its velocity is zero. d)its velocity and acceleration are both zero.

Under normal conditions, describe how increasing the temperatures effects the solubility of a typical salt

The energy released by a nuclear fusion reaction is produced when