12. The amount of kinetic energy an object has depends on what?

13. What is the acceleration of a train that starts from rest and reaches the speed of 105m/s in 30.0 seconds?

14. The speed of a car is decreased uniformly from 30 meters per second to 10 meters per second in 4.0 seconds. What is the magnitude of the car's acceleration?

15. A moving object that does not vary its speed is said to be moving at average velocity, constant velocity, average speed, constant speed, or equilateral speed? Explain your answer.

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