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Conservation of Energy Problems 1. At room temperature, an oxygen molecule, with mass of 5.31x10 26 kg typically has a KE of about 6. 12x10 21 J. How fast is the molecule moving? 2. How much work must be done to stop a 1250-kg car traveling at 105 km/h? 3. (a) If the KE of an arrow is doubled, by what factor has its speed increased? (b) If its speed is doubled, by what factor does its KE increase? 4. An 88-g arrow is fired from a bow whose string exerts an average force of 1 10 N on the arrow over a distance of 78 cm. What is the speed of the arrow as it leaves the bow? 5 . A 7.0-kg monkey swings from one branch to another 1.2 m higher. What is the change in potential energy