I. Jet propelled aircraft
II. Rocket propulsion
III. The recoil of a gun
IV. A person walking
Which of the above is based on Newton's third law of motion
I and II only
I, II, III, and IV only
I and III only
I, II and III only
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Discussions (14)
Newton's third law of motion states that for every action, there is an equal and opposite reaction. This means that when an object exerts a force on another object, the second object exerts an equal and opposite force back on the first object.
In option I, jet propelled aircraft, this law applies as the engine expels hot gases backward, causing the aircraft to move forward with an equal and opposite force. In option II, rocket propulsion, the law also applies as the rocket expels exhaust gases in one direction, causing the rocket to move in the opposite direction. In option III, the recoil of a gun, this law applies as when a gun is fired, the bullet is propelled forward with an equal and opposite force that causes the gun to recoil backward. However, in option IV, a person walking, this law does not apply as it involves the interaction between a person's foot and the ground rather than two separate objects. so my school.com please 
correct your errors okay
ans is B...all d options are related to newton's third law of motion which says "4every action there is always equal and opposite reaction
As we al knw dat action is equal to reaction...and walkng is amomg of it...the force we exerted is equal to the one exerting by the flor in direction
The answer there should be B not D
Walking is possible because of when u press ur foot on d ground,there wud b an equal and opposite reaction dat wud lift it up.
Thanks and please correct soon
It is d reaction force produce by d friction between d feet n d floor dat enables smone to walk n not fall,dats y one easily fall on slippery tiles,so d answer is B
