A3kg book falls from a shelf. if it lands with a speed of 4.8 m/s, from what height did it fall? a. 28.8 m , b. 1.2 m , c. 0.6 m , d. 14.1 m

The coefficient of friction is a number that represents the resistance to sliding between two in contact with one another.

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.

The diagram shows a wave. the quantity shown is the amplitude. this quantity is directly proportional to which of these other quantities? a) energy b) frequency c) period d) wavelength