Relative to the distance of an object in front of a plane mirror, how far behind the mirror is the image?

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

This is the number of complete movements of a wave per second.

Apotter's wheel moves uniformly from rest to an angular speed of 0.20 rev/s in 32.0 s. (a) find its angular acceleration in radians per second per second. rad/s2 (b) would doubling the angular acceleration during the given period have doubled final angular speed?