applied calculus

Classical Mechanics Level pending

suppose a bullet enters in a block of length 20m with velocity $$V_o$$ .It emerges from other side of block with velocity $$V_o / e^{2}$$ The resistance offered by block is directly proportional to square of velocity of penetration. then the time it spends in the block=$$\zeta/V_o$$ find $$\zeta$$

take $$e=2.72$$

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