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16. If you exert a force of 60. N on a car, it 13. What is the acceleration of a 6.0 kg moves at a constant velocity. (i.e. there object hanging on a string that is under a is a frictional force of 60. N) What is its tension of 80.0 N? mass if when you exert 80 N on it, it accelerates from rest to 2.0 m/s in 100. seconds? 17. A 60.0 kg rocket accelerates upward from rest reaching a height of 23.4 m in 3.0 seconds. What is the thrust force 14. What force is needed to accelerate a produced by the engine? 60.0 kg cart and rider from rest to 4.2 m/s in 2.5 seconds when the friction force is 24 N? 19. What tension would accelerate a 5.0 kg object suspended on a string a) upwards at 6.2 m/s ? b) downwards at 6.2 m/s?? 18. It takes 45 N to make a 10.0 kg cart move at a constant speed. What force does it take to make the cart accelerate at 3.2 m/s in the direction it is moving