The drift velocity measures the instantaneous speed of the electrons between the collisions they experience in the metal. the drift velocity is very slow, and a typically describes a microscopic displacement over a period of a second. the drift velocity measures the speed of the atomic nuclei drifting through the metal. the drift velocity is very fast and is directly responsible for the short time required an electrical signal to reach a light bulb when you flip a light switch from across the room. the drift velocity measures the rate at which electrons leave the surface of the metal. your answer

dang that balls went far

note: the given question is incomplete.

complete question is given below.

which is an example of kinetic energy?

a. the energy stored in ethanol  

b. a hockey puck sliding across the ice  

c. a compressed spring  

d. a ball sitting at the top of a ramp

solution: the kinetic energy is the energy posses by the virtue of the motion of the object.

in the given options, a, c and d are the example of potential energy because it is the energy posses by the virtue of the rest of the object. but option b has the kinetic energy as the object is in motion.

hence, a hockey puck sliding across the ice   is the apex example of kinetic energy.

so, the option (b) a hockey puck sliding across the ice   is the correct option.