You fire a bullet of inertia \(m\) into the block shown in Figure P9.43. The bullet is initially traveling at speed \(v\), and the inertia of the block is \(4 \mathrm{~m}\). The surface on which the block sits is rough, and the spring has spring constant \(k\). The bullet becomes embedded in the block. If the spring compresses a maximum distance \(d\), what is the magnitude of the frictional force exerted by the surface on the block while the block is moving?

Data from Figure P9.43

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