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A bullet of mass 50g moving with velocit...

A bullet of mass 50g moving with velocity `600m//s` hits block of mass `1.0kg` placed on a rough horizontal ground and comes out of the block with a velocity of `400m//s`. The coefficient of friction between the block and the ground is `0.25`. Neglect loss of mass of the block as the bullet pierces through it.
(a) In spite of the fact that friction acts a an external force, can you apply principle of conservation of momentum during interaction of the ullet with the block?
(b) Find velocity of the block immediately after the bullet pierces through it. (c)FInd the distance the block will travel before it stops.

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