Calculate the de Broglie wavelength of a 143 g baseball traveling at 95 mph.

Wavelength = plancks constant / (mass*velocity)

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

mass = 143g = 0.143kg

velocity = 95mi/1hr (1609.3m/1mi) (1hr/3600sec) = 42.4676m/s

h/mv = 6.63*10^-34kg-m^2/s^2-s / (42.4676m/s*0.143kg ...

wavelength = 1.3*10^-34 m (really small)

good luck! (always make sure units cancel out)