A wooden block with mass 1.60kg is placed against a compressed spring at the bot

Question

A wooden block with mass 1.60kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 33.0? (point A). When the spring is released, it projects the block up the incline. At point B, a distance of 6.90m up the incline from A, the block is moving up the incline at a speed of 7.50m/sand is no longer in contact with the spring. The coefficient of kinetic friction between the block and incline is ?k = 0.45. The mass of the spring is negligible.   

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

Take free fall acceleration to be 9.80m/s2 .

Explanation / Answer

GPE of block at B = mgh = 1.6(9.80)(6.90 sin 33) = 108.1 J
KE of block at B = 1/2mV

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