A bullet of mass 0.1 kg moving horizonta...

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 surfaceThe 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________(Given g = 10`m/s^2`

0.65

0.5

0.25

0.9

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