What is the de broglie wavelength of a 149-g baseball traveling at 95.4 mph? (1 mile = 1.609 km, h = 6.63 * 10-34 j·s) ?

The solution for the problem is:

Wavelength = Planck’s constant / (mass*velocity)

Planck’s constant = 6.63*10^-34 with units of J-s or kg-m^2/s^2-s

mass = 149g = 0.149 kg

velocity = 95.4. mi/1hr (1609.3m/1mi) (1hr/3600sec) = 42.65m/s

h/mv = 6.63*10^-34 kg-m^2/s^2-s / (42.65m/s*0.149kg)

wavelength = 1.04 * 10^-34 m