C) 60 mi ahr = 30 mph 3 hr = 20 mph 3. At time t = 0, a rock rolls horizontally off the edge of a 50 m high cliff. The rock's initial velocity is 10.0 m/s. Neglect air friction. (a) How much time will it take the rock to hit the ( horizontal) ground below at point x? (b) What is the distance x? (c) What are the horizontal and vertical components of the rock's velocity vector just before it hits the ground? (d) What are the magnitude and direction of the velocity vector in part (c)? O