Explain swimming based on one of the laws of motion?

Newton's Third Law of Motion states that for every action, there is an equal and opposite reaction. Thus, swimmers must stroke downward in the water to stay afloat and propel forward. This movement is equal and opposite to the force the water exerts against the swimmer to stop them from moving.

0.11 m/s and 0.28 m/s should be correct

a lot of it means it can be "burned" for energy and sold at one price. if it is scarce, the price will go up