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# Kinematics derivation watch

1. I know that the formula is as follows:
s=ut + 1/2(at^2)
But my question is why is this derivation incorrect , where's the fault?
V = u+at
S/t = u + at
S = ut + at^2
I know the half is missing but I'm not sure it seems to work algebraically

Posted from TSR Mobile
2. (Original post by Futurechemist)
I know that the formula is as follows:
s=ut + 1/2(at^2)
But my question is why is this derivation incorrect , where's the fault?
V = u+at
S/t = u + at

S = ut + at^2
I know the half is missing but I'm not sure it seems to work algebraically

Posted from TSR Mobile
v is the final velocity
s/t =v gives the displacement if you're travelling at constant final velocity

s=ut+1/2at2 gives you distance covered while under a constant acceleration - not at constant velocity.

you've mixed up formula for constant velocity and constant acceleration.

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