Answer:
FNet = 437N
Explanation:
The equation for net force is
FNet = Fa + Fg + Ff + FN. where FNet is the net force, Fa is the applied force and Fg is the force due to gravity, Ff is the frictional force and FN is the normal force
We do not have a normal force or a force due to gravity
FNet = Fa + Ff
Applied force Fa = 837 N
The frictional force works opposite the applied force
Frictional force Ff = -400 N
FNet = 837 - 400
FNet = 437N