Question

Define acceleration and derive v2-u2=2as

Answer 1

The rate of change of velocity is called acceleration.

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Answer 2

Here is ur answer dear  :-)

(1)Acceleration  In physics, acceleration is the rate of change of velocity of an object with respect to time. An object's acceleration is the net result of all forces acting on the object, as described by Newton's Second Law. The SI unit for acceleration is metre per second squared.

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Derivation of third equation of motion or V²-U²=2as :-

From 1st equation of motion,

                                            

                                            V = U + AT

                                           Therefore, V - U = AT 

We know that 

  

                    S = (U + V / 2 )×T

   

                  ∴ S/T = U + V / 2

                   ∴U + V = 2×S/T

                   ∴ U + V = 2 S / T

So Substituting equation 1 and equation 2, 

      

                                (V - U ) (V + U ) = AT ×2 S/T

 

                                 ∴V² - U² = 2 AS.

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