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Although they may not be detectable, the wavelength can be calculated. A car for example, does have mass and could have velocity and therefore could apply to the equation, the wavelength will not be detectable however.
An object like a car would have too great a mass to produce measurable wavelike properties. In some of the homework problems, cars yielded a projected wavelength of about 10^-38m. This wavelength would be too small to be considered noticeable, although we have detected it. Only very small particles produce a wavelength that is proportionally noticeable. For example, the examples with electrons usually yield a DeBrogile wavelength of around 10^5. The cutoff for what is "detectable" or not is 10^18m. Hope this helps!
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