An elevator moves downwards at a constant speed. When drawing the free body diagram for this motion:

A) there is no upwards tension force, only a gravity force.
B) the upwards tension force should should be drawn the same length as the downwards gravity force.
C)The upwards tension force should be drawn longer than the downwards gravity force.
D) The upwards tension force should be drawn shorter than the downwards gravity force.

Asled is being held at rest on a slope that makes an angle θ with the horizontal. after the sled is released, it slidesa distance d1 down the slope and then covers the distance d2 alongthe horizontal terrain before stopping. find the coefficient ofkinetic friction μk between the sled and the ground, assumingthat it is constant throughout the trip. find the coefficient of kinetic frictionμk. express your answer in terms of someor all of the variables d1, d2, and θ.