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A wooden block with mass 1.55 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 31.0 (point A). When the spring is released, it projects the block up the incline. At point B, a distance of 6.05 m up the incline from A, the block is moving up the incline at a speed of 6.30 m/s and is no longer in contact with the spring. The coefficient of kinetic friction between the block and incline is = 0.50. The mass of the spring is negligible.
Calculate the amount of potential energy that was initially stored in the spring.
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