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Three boxes are lined up so that they are touching each other on a nearly frictionless...

Three boxes are lined up so that they are touching each other on a nearly frictionless plane. Box A has a mass of ?A=21.5 kg,mA=21.5 kg, box B has a mass of ?B=28.0 kg,mB=28.0 kg, and box C has a mass of ?C=55.0 kg.mC=55.0 kg. An external force ?⃗ F→ pushes on box A toward the right, and the force that box B exerts on box C has a magnitude of 201 N.201 N. Ignore friction.

What is the magnitude of the acceleration ?a of the boxes?

What is the magnitude ?F of the external force?

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