1. A 1300-kg car moving at 20m/s hits the fence and comes to a stop in 2 s. what is the average forced acted to the car? 2. A lady tennis player hits an approaching ball with a force of 750 N. If she hits the ball in 0.002, how much impulse is imparted to the tennis ball?​

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.