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In K=(p^(2))/(2m) find the relative erro...

In `K=(p^(2))/(2m)` find the relative error. (Take mass m, constant)

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`(DeltaK)/(K)=2(Deltap)/(p)+(Deltam)/(m)` but `Delta m=0` is constant `:.(DeltaK)/(K)=(2Deltap)/(p)`
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