If you just stand still on an escalator (moving stairway), it takes 20 s for it to carry you up one floor, about 5 m. But if youwalk up, you get to the top of the escalator in only 12 s. A. How much work does the escalator do in lifting you up to the next floor, if you just stand there?B. How much if you walk up? C. Some people expect the answer in part (b) to be the same as in part (a), saying that the escalator is still exerting the same force over the same distance; some people expect it to be more, saying that when your walk up your feet press down harder on the stairs than the do if you just stand, so the force is greater; and some people expect it should be less, saying that you're expending energy, so the escalator must expend less. Explain the problem with the reasoning by the folks who have it wrong.

explanation: in any substance/object, the particles inside it (atoms/molecules) constantly move in random directions and with random speeds (this motion is called brownian motion). as a result, the particles have some kinetic energy (which is proportional to the temperature of the substance).

explanation:

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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.