A wooden block with mass 1.95 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 32.0 ° (point a ). when the spring is released, it projects the block up the incline. at point b , a distance of 4.75 m up the incline from a , the block is moving up the incline at a speed of 5.85 m/s and is no longer in contact with the spring. the coefficient of kinetic friction between the block and incline is µk = 0.45. the mass of the spring is negligible.
Calculate the amount of potential energy that was initially stored in the spring.