Let's convert the quantities in SI units first. The force exerted by the horse is [tex]F=200 lb=889.6 N[/tex] and the distance covered is [tex]d=3 mi=4828 m[/tex] Therefore, the work done by the horse is equal to the product between the force applied and the distance: [tex]W=Fd=(889.6 N)(4828 m)=4.29 \cdot 10^6 J[/tex]
