A bullet of mass 10 g and speed 500 m/s is fired into a door and gets embedded exactly at the centre of the door

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#1

A bullet of mass 10 g and speed 500 m/s is fired into a door and gets embedded exactly at the centre of the door. The door is 1.0 m wide and weights 12 kg. It is hinged at one end and rotates about a vertical axis practically without friction. Find the angular speed of the door just after the bullet embedded into it.


#2