The wavelength of a tennis ball of mass 57 g travelling at 80 km h^-1 is \ \ \ \ × 10^-34 m. (Nearest integer) [Use: h =6.6 × 10^-34 J s ]

The wavelength of a tennis ball of mass $\displaystyle 57$ g travelling at $\displaystyle 80 \mathrm{~km} \mathrm{~h}^{-1}$ is \_\_\_\_ $\displaystyle \times 10^{-34} \mathrm{~m}$. (Nearest integer) [Use : $\displaystyle \mathrm{h}=6.6 \times 10^{-34} \mathrm{~J} \mathrm{~s}$ ]