What is Third Equation of Motion
Third Equation of Motion
According to the definition of the acceleration “the rate of change of velocity is called acceleration”.
Acceleration = Change of Velocity/Time
=> a = (Vf – Vi)/t
=> a= Vf – Vi
Or
t = (Vf – Vi)/a ——–(i)
Substituting the average velocity
Vav = (Vi + Vf)/ 2 ————–(ii)
We know that:
Vav = S/t
S = Vav * t
Putting the value of Vav from equation (ii) and value of t from eq (i):
S = [(Vi + Vf)/2] * [(Vf-Vi)/a]
S = Vi2 – Vf2/2a since {(a+b) (a-b) = a2 – b2}
Or
2as = Vf2 – Vi2
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