Problem 2: Radial acceleration (6 pts.) You tie a rock to a string and swing it in a horizontal circle above your head. The length of the string is initially 75 cm, and the initial speed of the rock is 5 - A. What direction is the radial acceleration: Perspective 1. When the rock is at the right-most point in the circle? 2. When the rock is at the left-most point in the circle? B. What is the radial acceleration of the rock? C. You shorten the length of the string to 48 cm, and then swing the rock so that the radial acceleration is the same as what you found above, What must the speed of the rock be in this case