What are the types of heat creating energy

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.

What is a carrier wave and how does it affect what you hear on the radio

Most of the volume of an atom is occupied by the