An overnight rainstorm has caused the major roadblock. Three massive rocks of mass m1 = 542 kg, m2 = 884 kg and m3 = 333 kg have blocked the busy road. The rocks are side by side blocking road and lined up from left to right in order as m1, m2 and m3. The city calls the local contractor to employ a bulldozer to clear the road. The bulldozer applies constant force to m1 to slide the rocks off the road. Supposing the road is a flat frictionless surface and rocks are all in contact, what force, FA, should be applied to m1 to slowly accelerate the group of rocks from the road at 0.250 m/s2?