0. The SI unit of velocity is . a. meters per second b. miles per hour c. meters per millisecond d. kilometers per second ANS: C Units of velocity in SI are meters per second (m/s). 11. Mass density should be reported in which units? a. Coulomb/kilogram b. Newtons per square meter c. Kilograms per cubic meter d. Kilograms per square meter ANS: C Mass density should be reported with units of kilograms per cubic meter (kg/m3). 12. An object at rest will if no outside forces are applied. a. stay at rest b. decrease mass c. increase velocity d. decrease velocity ANS: A An object at rest will stay at rest if no outside forces are applied. 13. Which of the following explains the difference between speed and velocity? a. One has motion, and the other does not. b. One involves acceleration, and the other does not. c. One involves time, and the other does not. d. One has direction, and the other does not. ANS: B Velocity includes acceleration and speed does not. Speed is the rate at which an object covers distance. 14. For every action, there is an equal and opposite reaction, this describes which Newton’s law? a. Newton’s first law of motion b. Newton’s second law of motion c. Newton’s third law of motion d. Newton’s law of inertia ANS: C Newton's third law of motion states that for every action, there is an equal and opposite reaction