Physics

Problem

A bullet of mass

0.1 \text{ kg}

is fired on a wooden block to pierce through it, but it stops after moving a distance of

50 \text{ cm}

into it. If the velocity of bullet before hitting the wood is

10 \text{ m/s}

and it slows down with uniform deceleration, then the magnitude of effective retarding force on the bullet is

x \text{ N}

. The value of

x

to the nearest integer is ............