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Lab 6 Post-Lab Questions Question Post.1: A car of mass 1000 kg is at the top of a 10 hill, as shown in Figure 6. 5. (a) What is its gravitational potential energy 10 relative to the bottom of the hill? -50 m Figure 6. 5 (b) If the car rolls down the hill (with the engine off) with negligible frictional forces, what will the car's kinetic energy be when it reaches the bottom? (c) Suppose that frictional forces were not negligible. In fact, suppose the frictional forces did a total of 50 kJ of work on the car as it rolled down the hill. What would the kinetic energy of the car be when it reaches the bottom of the hill? Lab 6: EnergyQuestion Post.2: The graph in Figure 6. 6 shows a plot of the force exerted on a spring vs how much the string stretches from its equilibrium length in response to that force. Show your calculations for each part below. (a) What is the spring constant of this spring? 14.0 12.0 10.0 2 8.0 Force 6.0 4.0 2.0 0.0 1.0 2.0 3.0 4.0 5.0 Position ( m ) Figure 6. 6 (b) What is the elastic potential energy when the spring is stretched 1.5 m from its equilibrium length? Lab 6: Energy 110