Hi there. I am having a hard time understanding these two problems. Please provide steps with concepts. If any. Thank you!!

You decide to roll a0.15-kgball across the floor so slowly that it will have a small momentum and a large de Broglie wavelength.

If you roll it at1.3103m/s1.3103m/s,what is its wavelength?

&

How does this compare with the de Broglie wavelength of the high-speed electron that strikes the back face of one of the early models of a TV screen at 1/10 the speed of light(2.41011m2.41011m)?