Question

"How much work is required to lift an object with a mass of 5.0 kilograms to a height of 3.5 meters?" What would be the formula for this?

Answer 1

The answer is 172 J (or 1.72 · 10² J)

A work (W) is a product of a force (F) and a distance (d): W = F · d
Since the force is a product of mass and acceleration: F = m · a
then work would be: W = m · a · h

It is known:
m = 5 kg
h = 3.5 m
a = 9.8 m/s² (gravitational acceleration, since is expected that on some height gravitation force will work).

Therefore,
W = 5 · 9.8 · 3.5 = 171.5 J ≈ 172 J ≈ 1.72 · 10² J