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Q1 15 Points Solve the following problems concerning energy concept. a. What is the elastic potential energy of a car spring that has been stretched 0.5 meters? The spring constant for the car spring is 90 N/m. b. What power (W) is developed by a 55 kg person who does 20 chin ups, h = 3 m, in 45 seconds? C. An excavator in a coal mine can move 25 stones weighing half a metric ton each, from ground to a height of 5 meters within 1 minute. Calculate its power in horse power. Please select file(s) Select file(s)