Out of the following statements, which one is correct ?

1. the sum of action and reaction on a body is zero.
2. action and reaction act on different bodies in opposite direction.
3. action and reaction are always in opposite direction on the same body.
4. action and reaction act on different bodies in the same direction.

action and reaction act on different bodies in opposite direction.

Reason — The action and reaction never act on the same body, but they always act simultaneously on two different bodies i.e., the forces on interaction are always present in a pair.