If the displacement of an object is proportional to square of time, then the object moves with 

(a) uniform velocity 

(b) uniform acceleration 

(c) increasing acceleration 

(d) decreasing acceleration

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2 Answers

(b) uniform acceleration

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Correct Answer - (b)
From `s = ut + (1)/(2)at^(2)`, `s = (1)/(2)at^(2)`, when `u = 0`.
If a is constant, `s prop t^(2)`
i.e., when acceleration is uniform, `s prop t^(2)`.

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