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A wooden block with mass 1.65 kg is placed against a compressed spring at the bottom...

A wooden block with mass 1.65 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 4.10 m up the incline from A, the block is moving up the incline at a speed of 6.85 m/s and is no longer in contact with the spring. The coefficient of kinetic friction between the block and incline is ?k = 0.40. The mass of the spring is negligible.

A. Calculate the amount of potential energy that was initially stored in the spring.

Take free fall acceleration to be 9.80 m/s2 .

***** Please show all work. Thanks!

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