How to establish the mechanical energy of the system

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Q. A banked circular highway curve is designed for traffic moving at 62km/h. The radius of the curve is 217m. Traffic is moving along the highway at 42.00 km/h on a rainy day. What is the minimum coefficient of friction between tires and road that will allow cars to take turn without sliding off the road? (Assume the cars do not have negative lift.)

Q. A mass-spring system oscillates with amplitude of 3.3cm. If the spring constant is 226 N/m and the mass is 448g, establish the mechanical energy of the system.

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