A wooden block with mass 1.50 kg is placed against a compressed spring at the bo

Question

A wooden block with mass 1.50 kg is placed against a compressed spring at the bottom of an incline of slope 30 degrees (point A). When the spring is released, it projects the block up the incline. At point B, a distance of 6.00 m up the incline from A, the block is moving up the incline at 7.00 m/s and is no longer in contact with the spring. The coefficient of kinetic friction between the block and the incline is uk = .50. The mass of the spring is negligible. Calculate the amount of potential energy that was initially stored in the spring.

Explanation / Answer

Amount of potential energy = KE + GPE + Wfriction = 1/2 * 1.5*7^2 + 1.5*9.8*6sin30 + 0.5*1.5*9.8cos30 *6 = 119.04 J

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