A bullet of mass 0.075 kg traveling horizontally at a speed of 300 m/s embeds it

Question

A bullet of mass 0.075 kg traveling horizontally at a speed of 300 m/s embeds itself in a block of mass 78 kg that is sitting at rest on a nearly frictionless surface.
What facts/principles do you needs to know/apply to solve for the speed of the block? (Note, some of these may be true, but not useful in this situation; think carefully about why some answers may or may not apply)
1.There are no external torques.
2.There is no external work.
3.There are no external forces.
4.The angular momentum principle; the change in the angular momentum of the system equals the net external torque done on the system.
6.The momentum principle; the change in momentum of the system equals the net external force on the system.
7.The energy principle; the change in the energy of the system equals the net work done on the system plus the heat transfer.

Explanation / Answer

.The momentum principle; the change in momentum of the system equals the net external force on the system.

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