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.

Which of the following are examples of Newton's third law of motion?

(i) While catching a ball, the cricketer withdraws his hands along with the ball.

(ii) Athletes often land on sand after taking a high jump.

(iii) Motion of a man on ground

1. (iii)
2. (ii)
3. (i)
4. all of the above.

Name and state the action and reaction in the following cases —

(a) firing a bullet from a gun,

(b) hammering a nail,

(c) a book lying on a table,

(d) a moving rocket,

(e) a person walking on the floor,

(f) a moving train colliding with a stationary train.

“The action and reaction both act simultaneously.” Is this statement true?