What is the mass of a baseball clocked moving at a speed of 105 mph or 46.9 m/s and wavelength 9.74 * 10-35m?

For this problem to be solved, we make use of the de Broglie formula which is written below as follows:

λ = h/mv

where h is 6.626*10⁻³⁴ J·s

9.74 * 10⁻³⁵ m = 6.626*10⁻³⁴ J·s / (m) (46.9 m/s)

Solving for m,

m = 0.145kg