Question

derive Newton's third equation of motion​

Answer 1

Newton's Third equation of motion

✒ We know that

✒ v = u + at

✒ Squaring both sides

✒ v² = ( u + at )²

✒ v² = u² + 2uat + a²t²

✒ v² = u² + 2a ( ut + 1/2 at² )

✒ From second equation of motion we know that ( ut +1/2 at² ) = s

✒ v² = u² +2as

Third equation of motion

✏ v² = u² + 2as

Answer 2

The Third Law of Motion states, "For every action, there is an equal and opposite reaction." This law describes what happens to a body when it exerts a force on another body. Forces always occur in pairs, so when one body pushes against another, the second body pushes back just as hard. For example, when you push a cart, the cart pushes back against you.

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