Apuck of mass 0.150 kg is moving on a frictionless, horizontal air track with a speed of 0.9m/s. it has a head-on collision with another puck of mass 0.300 kg that is moving to the left with a speed of 2.2m/s. find the final velocity (magnitude and direction) of each glider if the collision is elastic.

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.