Runif Help: same variable, 3 different parameters

So I am working on an economic model and I need to change the parameters of
the runif statement as time goes on.

Ex.

X <-runif(1:50,0,5)
X <-runif(51:100,100,150)
X <-runif(100:T, 1,2)

Not sure how to go about entering this in to R properly.

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