Answer:
F= 56 N
Step-by-step explanation:
Work theory 
Work is the product of a force applied to a body and the displacement of the body in the direction of this force. 
W= F*d Formula (1) 
W: Work (Joules) (J) 
F: force applied (N) 
d=displacement of the body (m) 
The work is positive (W+) if the force goes in the same direction of movement. 
The work is negative (W-)if the force goes in the opposite direction to the movement 
Data 
W==2240 J
d= 40m
Problem development
We apply the formula (1)
W= F*d 
2240J= F* 40m
F = 2240 N*m / 40m
F= 56 N