Q1 A)Initially standing still and a skier with a mass of 72 kg (including skis) starts to slide down the slope at an angle of 18 with the horizontal. The kinetic coefficient of friction between the skis and the snow surface is uk = 0.12. Calculate the work done by the forces acting on the skier in the first 7 seconds of skiing. bx B)To bring a special spring back to equilibrium position F=-ax Here, x gives the distance from the equilibrium position. The values of a and b are 5.0 N / m and 15 N/ m3, respectively. Find the work done by stretching the spring from 0.10 m to 0.20m.