If the same car moves at the same speed in a universe where h = 6.626 Js, what is its wavelength?

Answer 1

The De Broglie wavelength (that is, the wavelength of a particle) is equal to Planck's Constant divided by momentum. You didn't post the car's mass or velocity, but it looks like you know them; if so, the wavelength λ is

λ = h / mv

where h is given in your problem statement.