A force of 200 N displaces a body by 4 m, calculate the work done (in J).

Work done ($W$) by a constant force is defined as the product of the magnitude of the force ($F$) and the displacement ($d$) in the direction of the force:
$$W=F\times d$$
Given:Force, $F=200\text{N}$ Displacement, $d=4\text{m}$ Substituting the values into the formula:
$$W=200\times 4=800\text{J}$$