Astudent decides to use some chemicals in the lab to make a powerful fuel for a small car he built. he goes to the parking lot and starts his rocket fuel car up which begins to move with a constant acceleration of 21m/s^2 along a straight path. how fast is he traveling after 2 seconds?

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.