4. A 3 kg block compresses a spring of negligible mass a distance of 0.1 m from its equilibrium position. If the surface is frictionless and the force constant of the spring is 200 N/m, and the block is free to move, find: a) the speed of the block just as it leaves the spring: b) the maximum height that the block will reach; 0.1m e) suppose that a part of the horizontal track is rough with a length of 0.05 m, find the coefficient of kinetic friction if the block reaches a maximum height of 0.014m.