Which statement best compares momentum and kinetic energy? a. both momentum and kinetic energy are vector quantities. b. momentum is a vector quantity and kinetic energy is a scalar quantity. c. kinetic energy is a vector quantity and momentum is a scalar quantity. d. both momentum and kinetic energy are scalar quantities.

The speed of light can be used to measure the

Aparticle's position is given by x = 3.00 - 9.00t + 3t2, in which x is in meters and t is in seconds. (a) what is its velocity at t = 1 s? (b) is it moving in the positive or negative direction of x just then? (c) what is its speed just then? (d) is the speed increasing or decreasing just then? (try answering the next two questions without further calculation.) (e) is there ever an instant when the velocity is zero? if so, give the time t; if not, answer "0". (f) is there a time after t = 3 s when the particle is moving in the negative direction of x? if so, give the time t; if not, answer "0".

Four friends, a, b, c, and d are standing varying distances away from a speaker which is producing sound waves.