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Question

With the usual notations, the following equation Sn=u+12a(2n−1) is

A
only numerically correct.
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B
only dimensionally correct.
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C
both numerically and dimensionally correct.
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D
neither numerically nor dimensionally correct.
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Solution

The correct option is A only numerically correct.
Given relation is Sn=u+12a(2n1)
So, comparing L.H.S and R.H.S dimensionally, on L.H.S Sn is the distance while on R.H.S, u is the speed, hence, it is not dimensionally correct. It is numerically correct only.

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