A slingshot, which can be modeled as a spring with spring constant k = 56.4 N/m, is stretched by 16 cm with respect to its equilibrium position and used to shoot a rock with mass 0.15 kg straight up into the air. Find the speed of the rock (in m/s) when it reaches a height which is 75% of its maximum height (relative to the position at which it was shot from). Use g = 9.81 m/s2. Hint: First find the maximum height, and then find the speed when the height is 75% of that

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