Question

Prove the 3rd equation of motion.

Tell that how you derived that equation.

Answer 1

Hi friend,

Refer the pic please.

Hope it helps..!!!

Answer 2

Third equation of motion;
v² - u² = 2as
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Proof :-

We know that,
v = u + at {first equation of motion}
v - u = at
t = (v-u)/a
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We also know that,
distance = average velocity × time

s = ((v+u)/2} × {(v-u)/a}
s = (v²-u²)/2a
v² - u² = 2as

hence proved!

hope it helps…