The correct answer is 21 m.
The term "uniformly accelerated motion" refers to a body or object moving at a consistent rate of acceleration. The absence of velocity does not imply constant acceleration. Therefore, if a body is in motion such that the amount of change in its velocity in equally spaced time intervals will be constant, then that is what is meant by uniform acceleration or uniform acceleration definition.
Given initial velocity = 0 m/s
acceleration = 6 m/s^2
The body's movement in nth seconds in terms of distance,
S_n = u + a/2 (2n-1)
S_4 = 0 + 6/2 ( 2 × 4 - 1 )
S_4 = 3 ( 8 -1 )
S_4 = 3 × 7
S_4 = 21 m
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