Question

what is third equation of motion

Answer 1

Third equation of motion:-

v² = u² + 2as

Here,

v = Final velocity

u = Initial velocity

a = Acceleration

s = Distance

Explanation:-

Average velocity = v + u / 2

Distance = Average velocity * Time

s = (v + u / 2) t

v + u = 2s / t - (i)

We know that,

v = u + at (first equation of motion)

v - u = at - (ii)

Multiply equation (i) & (ii):-

(v + u)(v - u) = 2s / t * at

v² - u² = 2as

v² = u² + 2as Proved.

Answer 2

There are three important equations of motion....
The first is v= u+at
The second is s=ut+1/2 at^2
The third is 2as=v^2-u^2