A boy pushes a concrete block with a force of 10 N the block moves 2 m in the direction of the force. How much work has he done
When a constant force moves an object and this force has the same direction as the displacement of this object, then work is a product of the force's magnitude and the object's displacement,
`W = F*d.`
Here `F=10N,` `d=2m` so work is 10*2 = 20 (Joules).
The answer: a boy did 20 J of work.