An empty delivery van has mass m m\,m and accelerates at a a\,a when the resultant force on it is FFF. Parcels are loaded into the van so that its total mass becomes 1.25m. What resultant force would give the loaded van an acceleration of 2a2a2a?
2.5F2.5F2.5F
0.4F0.4F0.4F
1.6F1.6F1.6F
2F2F2F