C. (8) With what speed, v, must the airplane fly in order Problem 4 (20 points) A child with mass m - 37.2 kg is playing in a park on a hot summer day. The grass in a particular part of the park has been sprayed with water and is wet and slippery. The child begins sliding on the wet grass with an initial speed of v. = 4.15 m/s. The surface of the grass, which the child is sliding on, is inclined at an angle of 0 - 7.00% above the horizontal. The coefficient of kinetic friction between the child and grass is UK = 0.231. The child slides a distance, d, along the inclined grass before coming to rest. V=O A. (5) What was the total work Wtot done on the child? B. (15) What distance, d, along the inclined grass did the child slide before coming to rest? Problem 5 (20 points)