S: 8 A bullet having a mass of 20 g and moving with a speed of 3m/s . penetrates a

S: 8 A bullet having a mass of 20 g and moving with a speed of 3m/s . penetrates a thick wooden plank of mass 700 g
. The plank was initially at rest. The bullet gets embedded in the plank and both move together. Determine their velocity ​

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