Askier traveling 12.0 m/s reaches the foot of a steady upward 18.0º incline and glides 12.2 m up along this slope before coming to rest. what was the average coefficient of friction?

Explanation:

As we know that skier start from the foot of the inclined plane with speed

v = 12 m/s

the angle of the inclined plane is

length of the inclined plane = 12.2 m

final speed of the skier = 0

so here we can use energy conservation

Work done against gravity + work done against friction = change in kinetic energy

so we will have

object 2 because all the other ones are wrong