Which object has the most kinetic energy?
a) a feather dropped from 5 feet
b) a basketball sitting on the ground
a boy skating down a steep hill
d) a truck falling off a cliff

it would be d

Explanation:

if you look at the ratio of speed of each thing the feather does not have enough weight to gather enough kinetic energy in a 5 ft drop a basketball on the ground gains no kinetic energy due to no actions are taken upon it a boy skating down a steep hill is close but it is a slow and gradual build up but compared to the truck falling off a cliff it holds more weight and due to that it gains more speed