A 0.66 kg ball is moving with a speed of 100 m/s.  The associated wavelength will be $\left(h=6.6\times {10}^{-34}Js\right)$

According to de-Broglie equation, $\lambda =\frac{h}{mv}$

Given h = $6.6\times {10}^{-34}Js$;  m = 0.66 kg

$v=100m{s}^{-1}$

$\therefore \lambda =\frac{6.6\times {10}^{-34}}{0.66\times 100}=1\times {10}^{-35}m$