3 equations of motion

The three equations of motion
 v = u + at ;
s = ut + (1/2) at2 and
v2 = u2 + 2as  
can be derived with the help of graphs. Consider the velocity – time graph of a body of Velocity–Time graph to derive the equations of motion.
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Three equation's of motion are: 1.v=u + at 2.ut+ half at square 3. v square - u square= 2as
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CONSTANT VELOCITY
1. s = vt

CONSTANT ACCELERATION
2. v = u + at
3. s = ut + ?at2?
4. average velocity = [v + u]/2?
5. v2?= u2?+ 2as (you have only asked for 3 equation but still Iam giving you five equations )
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The three equations of motion are :
V=u+at 
S=ut+(1/2)at^2
v^2=u^2+2as
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1.v=u+at 2. S=Ut +1/2+at 3. v^2=u^2 +2as
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