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Suppose that a ball is dropped from some height. What equation would you use to calculate...

Suppose that a ball is dropped from some height. What equation would you use to calculate the mechanical energy (the sum of the gravitational potential energy and the kinetic energy)?

If two springs are stretched different amounts by the same mass hung from them, which spring has the larger spring constant, the one that stretches most or the one that stretches least? Explain.

Suppose that there is a significant air resistance in addition to the spring force acting on the mass as it oscillates up and down. How will the elastic potential energy change? How will the mechanical energy change?

Is the mechanical energy constant for the motion of the mass with air resistance? Is mechanical energy conserved?

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