A cart loaded with bricks has a total mass of 13.8 kg and is pulled at constant speed by a rope. The rope is inclined at 30.6" above the horizontal and the cart moves 15.9 m on a horizontal floor. The coefficient of kinetic friction between ground and cart is 0.3. The acceleration of gravity is 9.8 m/s. What is the normal force exerted on the cart by the floor? Answer in units of N. 015 (part 2 of 3) 10.0 points How much work is done on the cart by the rope? Answer in units of k.J. 016 (part 3 of 3) 10.0 points Note: The energy change due to friction is a loss of energy. What is the energy change Wy due to fric- tion? Answer in units of k.J.017 10.0 points A mass of 0.41 kg is initially at rest on a hor- izontal surface. A force, given by F = Fri. acts on the mass. The horizontal component Fr is plotted below as a function of position along the r-axes. The coefficient of kinetic friction is Q. The acceleration of gravity is 9.8 m/s.Force ( N ) -1 -2 0 1 2 3 4 5 6 7 8 9 10 -Ar - position ( m ) Calculate the kinetic energy K of the mass is it reaches 6 m. Answer in units of J.019 (part 1 of 6) 10.0 points A heavy ball swings on a string in a circular arc of radius 1 m. I m Q P The two highest points of the ball's traject tory are Q and Q'; at these points the string is +190 from the vertical. Point P is the lowest point of the ball's trajectory where the string hangs vertically down. The acceleration of gravity is 9.8 m/s-. What is the ball's speed at the point P? Ne- glect air resistance and other frictional forces. Answer in units of m/s.020 (part 2 of 6) 10.0 points What is the magnitude of the ball's accelera- ion at the point P? 2 Answer in units of mI322 (part 4 of] 10.0 points 1What is the magnitude of the hall's accelera tion at the point (2'? Answer in unit}; of 111/52