What happens to a stone with a true weight of 4900 newtons in air when it is submerged in water displacing 9800 newtons of water?

When a stone weighs 4900 newtons and is submerged in water, it experiences an upward buoyant force equal to the weight of the water displaced. In this case, when the stone is submerged, it displaces 9800 newtons of water.

According to Archimedes' principle, an object will float if the buoyant force acting on it is equal to or greater than its weight. Since the stone's weight is 4900 newtons and it displaces 9800 newtons of water, the buoyant force (9800 newtons) exceeds the stone's weight. This results in a net upward force, causing the stone to float rather than sink.

In essence, the stone is less dense than the water since the buoyant force is significantly greater than its weight, which is why it will float. Thus, the correct interpretation of the situation is that the stone will not sink but will remain floating in the water due to this effective buoyancy.