A block B is placed on block A. The mass of block B is greater than the mass of block A . Fricti...

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A block B is placed on block A. The mass of block B is greater than the mass of block A . Friction exists between the blocks whereas  the ground on which the block A is placed is taken to be smooth. A horizontal force  F,  increasing linearly with time, begins to act on B . The accelerations \( {a_A} \) and \( {a_B} \) of blocks A and B respectively are plotted against t. The correctly plotted graph is:
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