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A bullet to mass 1 kg fired with a speed...

A bullet to mass 1 kg fired with a speed `2 mn^(-1) ` from x=0 passes through a block of wood whose centre is kept at a distance of 10 m from the origin as shown in the figure.
The retarding force `F_r` on the bullet within the wooden block is -0.5 /x.
The minimum length of the block (upto one decimal digit ) required to completely stop the bullet is ( Assume , `e^4 =55`)

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