You are driving on an interstate highway in bad weather, and you do not feel safe at the speed limit. you should a: follow closely behind a large truck. it will shield you from the weather. b: slow down to the speed that allows you to have complete control of your vehicle. c: always drive the same speed as other vehicles, even if it feels unsafe.

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.