What will happen to the compass needle if you hold a magnet close to it?

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.

When does your body conduct current more readily?

Why is the energy that results from a roller coaster's position at the top of a hill referred to as potential energy?