An electron begins at rest, and then is accelerated by a uniform electric field of 800 n/c that extends over a distance of 4 cm. find the speed of the electron after it leaves the region of uniform electric field. the fundamental charge is 1.602 × 10−19 c and the mass of the electron is 9.109 × 10−31 kg. answer in units of m/s.

mistakes are ok

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.