A bullet is fired normally on an immovable wooden plank of thickness 2 m. It loses 20% of its kinetic energy in penetrating a thickness 0.2 m of the plank. The distance penetrated by the bullet inside the wooden plank is

A bullet is fired normally on an immovable wooden plank of thickness 2

1.	A bullet is fired normally on an immovable wooden plank of thickness 2 m. It loses 20% of its kinetic energy in penetrating a thickness 0.2 m of the plank. The distance penetrated by the bullet inside the wooden plank is
Answer» 0.2m 0.8m 1m 1.5m Solution :The wood offers a constant retardation. If the BULLET loses 20% of its kinetic energy by PENETRATING 02 m. It can PENETRATE further into `4xx 0.2 = 0.8 m` with the remaining kinetic energy So the total DISTANCE penetrated by the bullet is `0.2 + 0.8 = 1 m`