Write a statement about your understanding of how momentum is conserved during a collision

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.

If element x has 99 protons how many electrons does it have

What is the name of the perceived change in a sound wave’s frequency due to motion between the observer and the sound source?