18. Complete the table below. Use the information in Model 2 or the graph in question 15 to estimate the kinetic energy for each situation. Total Mass of bike + rider Speed (m/sec) Kinetic Energy Joules) system Type of Riding (kilograms) 60 12 Long uphill .. 60 24 Long downhill 19. Which change in a system produces a greater change in kinetic energy? Use data from Model 1 and Model 2 to support your answer. a. Doubling the mass of the system b. Doubling the speed of the system c. Doubling either mass or speed d. You can't tell from the data tables

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