Why is it harder to build a supersonic ship than a supersonic airplane?Sound Sound velocity velocity is is greater greater in in water, water, and and it it is is harder harder to to move move through.through.Sound Sound velocity velocity is is greater greater in in water, water, and and it it is is easier easier to to move move through.through.Sound Sound velocity velocity is is greater greater in in air, air, and and it it is is harder harder to to move move through.through.Sound Sound velocity velocity is is smaller smaller in in air, air, and and it it is is harder harder to to move move through.through.
It would help if you proofread your questions before you posted them. You have several word duplications, which make it harder to understand.
It also helps to separate alternatives and number/letter designate them for easier response.
It is is harder harder to to move move through water.