According to the picture, how would the gravitational potential energy of the car change if its weight was doubled? a) the gravitational potential energy would be doubled. b) the gravitational potential energy would stay the same c) the gravitational potential energy would be cut in half. d) the gravitational potential energy would be increased by 750.

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.