A pallet of boxes weighing 10 tons is dropped from a lift truck from a height of 10 feet. The maximum velocity the pallet attains before hitting the ground is 6 ft/s. How much kinetic energy does the pallet have in (ft)(lbf) at this velocity?

Answer 1

An object dropped from 10 feet should acquire a velocity quite a bit higher than 6 ft/s, before impact. This problem is presenting conflicting data.

Perhaps they want you to use
(1/2) M V^2 for the kinetic energy. The mass would have to be
M = W/g = 20,000 /32.2 = 621 slugs
if you want the answer in ft-lbf