If you are in a moving bus, and throw a rock up the aisle to the front of the bus with a speed of 1 m/s from your perspective, will someone who is standing still outside the bus observe the same speed of the rock? Yes, it will be exactly the same. No, an outside observer will determine the rock is moving slower than 1 m/s. No, an outside observer will determine the rock is moving faster than 1 m/s