While out hiking, you and your buddy decide to have some fun with the rocks laying all around. while sitting on a high cliff, overlooking a lake, you drop each drop a rock into the water. describe the change in motion of the rock as it enters the water. a) the speed of the rock changes, but not its direction. b) the direction of the rock changes, but not its speed. c) both the direction and speed of the rock are changed by the water. d) neither the direction nor the speed of the rock are changed by the water.