What is the average velocity of the car over the first 0.25m? m/s what is the average velocity of the car over the second 0.25m? m/s

The voltage applied across a given parallel-plate capacitor is doubled. how is the energy stored in the capacitor affected?

The amount of potential energy possessed by an elevated object is equal to what?

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.