Determine the mass of a ball with a velocity of 40.0 m/s and a wavelength of 8.92 Ã 10-34 m.

The wavelength is equal to Planck's constant divided by the ball's momentum.

This means that:

lambda = h / p ... > equation I

Momentum = mass * velocity ... > equation II

Substitute by equation II in equation I, you get:

lambda = h / mv

Now, we are given:

lambda = 8.92 * 10^-34 m

Planck's constant = 6.625 * 10^-34

velocity = 40 m/sec

Substitute with these givens in the above equation to calculate the mass as follows:

8.92*10^-34 = (6.625*10^-34) / (40*m)

mass = 0.0185678 kg