Solution for the problem:
w = h / p
Where:
Wavelength = w
h = Planck's constant = 6.626e-34J*s
p = momentum = m * v
m = mass = 45.9g (1kg / 1000g) = .0459 kg
v = velocity = 66m/s
p = m * v = .0459 kg * 66m/s = 3.0294 N *s
w = h / p = (6.626e-34J*s) / 3.0294 N *s = 2.76e-34 m
