Item 12 onstants PartA A wooden block with mass 1.90 kg is placed against a comp

Question

Item 12 onstants PartA A wooden block with mass 1.90 kg is placed against a compressed spring at the bottom of a slope inclined at an angle of 27.0° (point A). When the spring is released, it projects the block up the incline. At point B, a distance of 8.00 m up the incline from A, the block is moving up the incline at a speed of 6.40 m/s and is no longer in contact with the spring. The coefficient of kinetic friction between the block and incline is h 0.50. 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 9.80 m/s SubmitPre Previous Answers Request Answer XIncorrect; Try Again; 4 attempts remaining

Explanation / Answer

From Work energy theorem

UA-UB+Wfriction =KB-KA

=>UA=mgdsin(o)+(1/2)mv2+ukmgdcos(o)

UA=1.9*9.81*8*sin27 +(1/2)*1.9*6.42+0.5*1.9*9.81*8*Cos27

UA=173.03 J

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