...-29 m. What is the speed o? The de Broglie wavelength of a 1-mg grain of sand being blown by the wind is 3 X 10 -29 m.
What is the speed of the grain of sand? How significant are its wave properties likely to be?
...PE is constant. At what point i? A yo-yo is swung in a vertical circle in such a way that its total energy KE + PE is constant. At what point in the circle is its speed a maximum? A minimum? Why?
