Highway curves are marked with a suggested speed. If this speed is based on what would be safe in wet weather, estimate the radius of curvature for an unbanked curve marked 80 km/h . Express your answer to one significant figure and include the appropriate units. r= __________ _____________ 10.) A spring has a spring stiffness constant kk of 70.0 N/m. How much must this spring be compressed to store 50.0 JJ of potential energy?

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Newton's First Law of Motion

If a very smooth ball is rolled down an inclined surface with zero friction, the ball will continue to roll indefinitely for an infinite time, in an attempt to reach to the same height on the opposite hill!