The force of gravity causes a projectile to follow a parabolic path: TRUE or FALSE?

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.

How will the system respond to a temperature increase?

Am i correct on these two physics questions?