The expansion of unit mass of a perfect gas at constant pressure is shown in the diagram. Here
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[$A$] The resistive force experienced by the plate is proportional to $\mathrm{v}$
[$B$] The pressure difference between the leading and trailing faces of the plate is proportional to uv
[$C$] The plate will continue to move with constant non-zero acceleration, at all times
[$D$] At a later time the external force $F$ balances the resistive force.
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