General Problems 52. Two vectors, V, and V2, add to a resultant VR = VI + V2. 58 Describe V1 and V2 if (a) VR = V1 + V2, (b) VR = V? + V2, (c) V1 + V/2 = V1 - V2. 53. On mountainous downhill roads, escape routes are some- times placed to the side of the road for trucks whose brakes might fail. Assuming a constant upward slope of 26, calcu- late the horizontal and vertical components of the acceleration of a truck that slowed from 110 km/h to rest in 7.0 s. See Fig. 3-48. Escape route Main road TOO downhill FIGURE 3-48 Problem 53. 54. A light plane is headed due south with a speed relative to still air of 185 km/h. After 1.00h, the pilot notices that they have covered only 135 km and their direction is not 59 south but 15.0 east of south. What is the wind velocity? 55. An Olympic long jumper is capable of jumping 8.0m. Assuming his horizontal speed is 9.1 m/s as he leaves the ground, how long is he in the air and how high does he go? Assume that he lands standing upright-that is, the same way he left the ground. 56. Romeo is throwing pebbles gently up to Juliet's window, and he wants the pebbles to hit the window with only a horizontal component of velocity. He is standing at the edge of a rose garden 8.0m below her window and 8.5 m from the base of the wall (Fig. 3-49). How fast are the pebbles going when they hit her window