I’m not sure if this is physics so if it’s not let me know, thanks. If it is not safe for you to determine a certain physical property of a
substance (such as the boiling point of your plastic lego), what should
you do?

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.