14. A spacecraft traveling at 1200 m/s is uniformly accelerated at the rate of 150 m/s2by burning its second stage rocket. If the rocket burns for 18 s, what is the final velocity of the craft?
Linear Motion Worksheet (p. 3)MOTION CONCEPTS 15. Can an automobile with a velocity toward the north have an acceleration toward the south? Explain. 16. Can an object reverse its direction of travel while maintaining a constant acceleration? If so, give an example. If not, explain why. 17. You are driving north on a highway. Then without changing speed, you round a curve and drive east. (a) Does your velocity change? (b) Do you accelerate? Explain. 18. Starting from rest, one car accelerates to a speed of 50 km/h, and another car accelerates to a speed of 60 km/h. Can you say which car underwent the greater acceleration? Why or why not? 19. Cite an example of something that undergoes acceleration while moving at a constant speed. Can you also give an example of something that accelerates while travelling at constant velocity? Explain 20. (a) Can an object be moving when its acceleration is zero? If so, give an example. (b) Can an object be accelerating when its speed is zero? If so give an example. 21. What is the acceleration of a car that moves at a steady velocity of 100 km/h for 100 seconds? Explain your answer.