PLZ HELP! WILL GIVE BRAINLIEST! Which of the following statements is true?
A Newton is equal to 9.8 m/s 2.
On a level surface, applied force equals weight.
Normal forces occur at perpendicular angles to the surface between two objects.
Action-at-a-distance forces require physical contact between objects.

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.