The Proof for Newton's Second equation of Motion s=ut+1/2 at²
Newton gave 3 equations for motion
1. v = u+at
2. s = ut+ 1/2 at²
3. v² = u²+2as
This is a proof for Newton's second equation of Equation s= ut+1/2 at²
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Let, s = displacement
t = time
V = average velocity between two points
u = initial velocity
v = final velocity
a = acceleration
Average Velocity (V) = displacement _________(1)
time
Average Velocity (V) = v+u _____ (2)
2
From 1 and 2
displacement = v+u
time 2
s = v+u
t 2
s = v+u+u-u
t 2
s = (v-u)+(u+u)
t 2
s = (v-u) + (u+u)
t 2 2
s = (v-u) + 2u .........by dividing
t×t 2t 2t both sides by t
s = a + u ...................(v-u) = a
t² 2 t t
s = [ a + u ] t²
2 t
s = at² + ut
2
s = ut + at²
2
s = ut + 1 at²
2
This the proof for Second equation of motion.
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