When a m = 12 kg mass is on a frictionless incline of 30 degrees and takes 270 N to compress a spring 2.0 cm: The block briefly stops when the spring is compressed to 5.5 cm a) How far did it travel. I found the answer is 35 cm b) What is the speed of the 12 kg block as it touches the spring? How do I do part b? I got the spring constant k = 13500 and used 1/2 kx^2 to find how many joules it has at compressing the spring to 5.5 cm. When I set that equal to 1/2 mv^2 I did not get the right answer. How would I go about finding b?

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Static and Kinetic Friction

Kinetic friction comes into existence when there are moving surfaces means in other words we can say that the force which comes into existing between moving surfaces is known as kinetic friction.