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In a "ballistic pendulum" a bullet hits a pendulum which is initially at rest. After the...

In a "ballistic pendulum" a bullet hits a pendulum which is initially at rest. After the collision the pendulum with the bullet embedded in it rises until it comes to rest. Which one of these is correct? (Neglect air resistance and friction in the suspension of the pendulum.)

The mechanical energy is conserved during the collision.
The mechanical energy is conserved during the swing.
The momentum is conserved during the swing.
Both the momentum and the mechanical energy are conserved during the swing. Both the momentum and the mechanical energy are conserved during the collision.

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