Answer
$\lambda =1.1\times10^{-34}\,m$
The wavelength is too small and is therefore negligible. Wave nature of matter is not important for the baseball due to this reason.
Work Step by Step
Mass $m= 143\,g=0.143\,kg$
Velocity $v= 95\,mph=$
$95\,mi/h\times\frac{1609.344\,m}{1\,mi}\times\frac{1\,h}{3600\,s}$
$=42.4688\,m/s$
Wavelength $\lambda=\frac{h}{mv}$
$=\frac{6.626\times10^{-34}\,Js}{(0.143\,kg)(42.4688\,m/s)}$
$=1.1\times10^{-34}\,m$
The wavelength is too small and is therefore negligible. Wave nature of matter is not important for the baseball due to this reason.
