Papa bless

a skier is skiing down a slope on the mountain. is the mechanical energy conserved? why or why not?

the mechanical energy is conserved. there is as much ke at the end as there was pe at the beginning.

the mechanical energy isn't conserved. some energy is lost to friction.

mechanical energy is always conserved.

the mechanical energy isn't conserved. some energy is lost to gravity.

The best and most correct answer among the choices provided by the question is the third choice. Mechanical energy is always conserved. I hope my answer has come to your help. God bless and have a nice day ahead! Feel free to ask more. 

Answertraveling around a circular trackexplanation"traveling around a circular track" is the best answer as you could be traveling around a circular track at a constant speed. your velocity would therefore have the same magnitude but will always be constantly direction. since acceleration is the rate of change of velocity, the rate of change will only involve the direction of velocity and not the magnitude.wrong choices: "an object at rest" does not accelerate at all"increasing speed while traveling around a curve" means that the acceleration will not be constant due to only change in direction; it will be constant due to both magnitude and direction"an object in free fall" does not necessarily change direction