If the average speed of a car is 45 km/hr, how far can it travel in 40 min?
falling objects drop with an average acceleration of 9.8 m/s2
if an object falls from a tall building, how long will it take before it reaches a speed of 49 m/s?
what is meant by a freely falling object?

conduction, convection, radiation

that would be because of both gravity and friction. so     c

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.