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. And for the true/false, for each question please explain why is either correct or wrong.

12. Displacement divided by time (= displacement / time) is . velocity C. both speed or velocity B. speed D. None of these. 13. When an objects falls, its _increases, and its also increases.. A. acceleration, displacement from start C. displacement from start, velocity B. velocity, acceleration D. All of these increase. 14. The area under an acceleration vs time graph at a certain time is the objects _at that time. . acceleration C. velocity B. distance or displacement D. None of these. True/False On the blank, write "T" if the statement is true, or "F" if the statement is false. If the statement is false, correct the underlined part to make the statement true 15. The slope of a velocity vs time (= v vs t) graph is the object's displacement 1 16. The Earth going around the sun is accelerating. -10m / 52 17. A ball is thrown straight up. At the top of its path, its speed is zero, and its acceleration is zero. 18. If a dog is running faster and faster, the velocity vs time (= v vs t) graph will be a curve. straight line 19. "Meter per second squared" is a unit of velocity. acceleration 20. Acceleration is a change in speed divided by (= "/") a change in time