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Using dimensional analysis, which equation is (a -> m/^2, v -> m/s, x -> m , t -> s)

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Using dimensional analysis, which one of the following equations is
(a -> m/^2, v -> m/s, x -> m , t -> s)

a. x = v/t
b. v = 2ax
t2 = x/a
c. x2 = 2av
d. x = at

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