I. a bus moving at 60 km/h north

II. a stone dropped from a given height

III. a car moving 40 km/h around the Fuente Osmeña rotunda

12. Which of the above objects is changing in speed?

A. I and11

B. I and III

C. II and III

D. I, II, and III

13. Which of the above objects is changing in velocity?

A. I and11

B. I and III

C. II and III

D. I, II, and III

14. Which of the above objects is accelerating?

A. I and11

B. I and III

C. II and III

D. I, II, and III

15. What refers to the speed of an object at a specific moment in time?

A. average speed

C. uniform or constant speed

B. instantaneous speed

D. zero speed ​