Answer to Question #102892 in Mechanics | Relativity for Emily Landry

Question

What is the main restriction for using the equation |mg| Delta h Delta U g =?

Answer 1

For the formula for the change of the potential energy in gravitational field

$$\Delta U_g=mg\Delta h$$

 the main restriction is

$$\Delta h \ll R_E$$

$R_E$ is the radius of the Earth.