Aprojectile is launched at an angle with the horizontal. which statement is true about its motion when it is travelling upward?

a. the magnitude of the horizontal velocity increases.
b. the magnitude of the vertical velocity remains constant.
c. the magnitude of the vertical velocity decreases.
d. the magnitude of the horizontal velocity decreases.
e. the magnitude of the total velocity remains constant.

Observations show that interstellar clouds can have almost any shape and

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.

Examples of states of consciousness include a. daydreaming b. dreaming during sleep c. hypnosis d. all of the above