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12. A 1,000 kg car moves at 5 m / s when the brakes are applied,...

12. A 1,000 kg car moves at 5 m / s when the brakes are applied, stopping after 5 seconds. The average force exerted on the car is ___N.

13. There is a 3 kg stone attached to a rope, describing horizontal circles of 1.2 m radius on a frictionless table, with angular velocity of 1.67 rads / s. The tension in the rope is approximately ___N.

14. A 2 kg object slides down a 10-meter ramp, from a height of 5 meters. It is observed that the speed of the object when it reaches the bottom is 4 m / s. We can assure that there was friction between the object and the ramp, and that said friction made a ___ J work on the object.
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