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A body starts from rest, under the actio...

A body starts from rest, under the action of an engine working at a constant power and moves along a straight line. The displacement S is given as a function of time (t) as:

A

`S =at + bt^(2)`, a,b are constants

B

`S=bt^(2)`, b is a constant

C

`S=at^(3//2)`, a is a constant

D

S=at, a is a constant

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