Question

How much work does it take to lift a box weighing 78.6 pounds straight up four feet?

Answer 1

Using W = FS, here assume you are lifting with constant speed, then F is equal to gravity

F = 78.6 * 0.45 = 35.37 N

S = 0.3 * 4 = 1.2 m

So W = 35.37 * 1.2 = 42.44 J