A force of 50 N acts on an object and moves it through a distance of 8 m in the direction of the force. What is the work done by the force?

Work done is calculated as W = F × d, where F is the applied force and d is the displacement in the direction of the force. W = 50 N × 8 m = 400 J. Option A results from dividing instead of multiplying, while option D arises from a decimal error.