3. Two charged spheres are placed with their centers 0.15 m apart. One has a charge of +25 x 10^-12 C and the other has a charge of -31 x 10^-12 C. What is the electric force exerted on one sphere by the other? (A)3.4 x 10-20 N
(B) 4.6 x 10'' N
(C) 3.1 x 10-0N
(D) 2.4 x 10°N

temp rises, and expansion

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.