Which waves give off heat?

Find the momentum for a 2.6-kg brick parachuting straight downward at a constant speed of 8.4 m/s .

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.

Explain the consequences of this addiction to the brain tissue