Septum is the tissue that separates the left and right sides of the heart.

**Answer:**

The final velocity of apple and arrow after the collision is 2 m/s.

**Explanation:**

Given that,

Mass of an arrow, m = 0.5 kg

Initial velocity of the arrow, v = 10 m/s

Mass of an apple, m' = 2 kg

Initial velocity of the arrow, v' = 0 (at rest)

We need to find the final velocity of apple and arrow after the collision. After the collision, the arrow and the apple are stuck together. It is a case of inelastic collision. Let V is the final velocity of apple and arrow after the collision. Using the conservation of linear momentum as :

**So, the final velocity of apple and arrow after the collision is 2 m/s.**

The net force is determined is basically who is pushing harder in a specific direction.Like since there bith pushing in the same direction the net force is in the direction that they are pushing.

**Answer:**

O c.the force of the fish tail on the water..........