What is the force required to lift the handles of a loaded wheelbarrow, total mass 80 kg, if the distance of the centre of gravity, i.e. the distance at which the entire load can be considered to act,...

What is the force required to lift the handles of a loaded wheelbarrow, total mass 80 kg, if the distance of the centre of gravity, i.e. the distance at which the entire load can be considered to act, from the wheel axle is 300 mm and from the effort 1000 mm?