A mass of 20lbf of mass is hanging on a spring that is fixed on the ceiling. The spring used is Aluminum with a  spring constant of 810 N/m. -For Problem above, which of the materials would give the minimum total deformation for the spring setup? Show  your solution and compare the deformation for each material. Rank from material with least deformation to material with  most deformation. a. Gold, 920 N/m b. Aluminum 8,10 N/m c. Titanium 1,450 N/m d. Platinum, 2,060 N/m

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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!