Starting from the top and at rest a block slides down an inclined plane and has a velocity of 1.45 m/s at the bottom. The inclined plane makes a 33.5o angle with the horizontal and is 3.71 meter long. The mass of the block is 2.77 kilogram. The acceleration of gravity is 9.8 m/s2. Find the potential energy of the block at the top of the incline? Suppose the bottom of the incline as zero of potential energy. Answer in units of J. Obtain the coefficient of friction between the block and the plane?