The two masses in the figure are released from rest. After mass $B$ has fallen $1.38 m$, it is moving with a speed of $3.63 m / s$. Mass $A$ has a mass of $1.63 \mathrm{~kg}$ an mass $B$ has a mass of $3.35 \mathrm{~kg}$, and the pulley is frictionless. How much work is done during this time interval by the frictional force on block $A$ ?

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