Block A is placed on block B, whose mass is greater than that \( \mathrm{P} \) of A. There is fr...

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Block A is placed on block B, whose mass is greater than that
\( \mathrm{P} \) of A. There is friction between the blocks, while the ground

W is smooth. A horizontal force \( \mathrm{P} \), increasing linearly with time, begins to act on \( \mathrm{A} \). The accelerations \( \mathrm{a}_{1} \) and \( \mathrm{a}_{2} \) of \( \mathrm{A} \) and \( \mathrm{B} \) respectively are plotted against time (t). Choose the correct graph.
a.
c.
d.
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