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A bullet of mass 0.1 kg moving horizontally with speed 400 ms –1 hits a wooden block of mass 3.9 kg kept on a horizontal rough surface. The bullet gets embedded into the block and moves 20 m before coming to rest. The coefficient of friction between the block and the surface is _______.

1. 0.90
2. 0.50
3. 0.65
4. 0.25

Correct answer: 0.25

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