A bullet of mass 0.04kg travelling horizontally at 100 m/s hits a stationary block of wood of mass 8kg, passes through it and emerges horizontally with a speed of 40 m/s. If the block is free to move on a smooth horizontal plane, what is the speed with which it moves after the bullet had passed through it?

A bullet of mass 0.04kg travelling horizontally at 100 m/s hits a stat

1.	A bullet of mass 0.04kg travelling horizontally at 100 m/s hits a stationary block of wood of mass 8kg, passes through it and emerges horizontally with a speed of 40 m/s. If the block is free to move on a smooth horizontal plane, what is the speed with which it moves after the bullet had passed through it?
Answer» ANSWER :0.3 m/s