A wood block rests at rest on a table. A bullet shot into the block stops inside

Question

A wood block rests at rest on a table. A bullet shot into the block stops inside, and the bullet plus block start sliding on the frictionless surface. The momentum of the bullet plus block remains constant

(1) When the bullet approaches

(2) When the bullet is slowing down    

(3) After the bullet stops

(4) 1 and 3

(5) 2 and 3

(6) 1 and 2

(7) It never is conserved.

(8) It always is conserved.

A wood block rests at rest on a table. A bullet shot into the block stops inside, and the bullet plus block start sliding on the frictionless surface. The momentum of the bullet plus block remains constant (1) When the bullet approaches (2) When the bullet is slowing down (3) After the bullet stops (4) 1 and 3 (5) 2 and 3 (6) 1 and 2 (7) It never is conserved. (8) It always is conserved.

Explanation / Answer

(8) It always is conserved.

m1v1= m2v2

* As long as there are no external forces
acting on the system

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