For the multiple-choice problems, please state the reason why each option is either correct or wrong. Only do the one that I got marked wrong which is in red mark.

PHYSICS TEST Ch2: Linear Motion Multiple Choice displacement : change of direction 20 Direction : I position - another Acceleration : change in velocity / time Circle the best answer choice, and on the blank, write the CAPITAL LETTER of the best answer choice 1. Which is FALSE? "Speed is A. measured in m/s. J C. constant (= the same) for the moon going around the Earth B. how fast an object is moving. D. a vector. A 2. If you are running away from the 0 m mark, but slowing down, your_ is negative A. velocity B. direction . acceleration D. All of these are negative. 3. If a dog is running faster and faster in the negative direction, his speed is _ and his acceleration is A. increasing, positive B. decreasing, positive C. decreasing, negative D. increasing, negative 4. Which is NOT accelerating? A. a rock falling in no air C. a car slowing down to a stop J B. a fast dragster going at constant speed D. a car in a curve at constant speed C 5. You drop a feather and a coin at the same time in a vacuum (= no air). In 1 s, which has greater acceleration? A. The coin C. Both accelerate at the same rate. B. The feather . None of these. A 6. A speedometer measures A. instantaneous speed. C. how far the car goes. B. average speed. D. instantaneous acceleration. 7. The area under a velocity vs time graph is the object's acceleration C. distance or displacement B. speed or velocity D. time traveled Scalar : amount 8. The length of the path an object traveled is A. displacement C. distance B. a scalar D. Two of these. vector : amount / speed 9. Which is NOT a unit for speed or velocity? A. meter per second- C. mi/h B. km/h _ D. All of these are possible units. 10. A difference between distance and displacement is that distance is d A. measured in meters. C. Ax or Ay B. a vector. D. None of these. 11. In the lab, a car went at a constant speed (= same speed). You made a graph of the car's position vs time. The slope of the position vs time (= x vs t) graph is the car's A. time it took to travel 1 m. C. distance or displacement B. acceleration D. speed or velocity U