posted by Britney .
Two objects are in contact on a frictionless surface. A horizontal force is applied to one object as shown in the figure below. Use m1 = 0.4 g, m2 = 223 g and F = 0.7 N to find the force between the two objects.
Since there is no "figure below", you need to tell us which object is being pushed by F.
Assume both objects accelerate at the same rate. The net force on each object must then be proportional to its mass. You can use that fact to compute the force between them