Question

How much work does gravity do on a 0.160-kg ball falling from a height of 20.0 m? (Neglect air resistance.)answer in:____ J

Answer 1

First, we need the formula for gravitational potential energy

$U_g=mgh$

the mass is .16 kg, g = 9.8 m/s^2, and h = 20 meters

Plugging all of these into the formula yields us,

U = (.16)(9.8)(20) = 31.36 joules