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A body is released to fall under the inf...

A body is released to fall under the influence of gravity and its equation of motion is given by `s(t)=(9t^(2)+4)sec`.Find the ratio of the instantaneous velocities of the body at the fifth second to that at the seventh second after release. A). ` 2:9` B). ` 1:2` C). `1:11` D). `5:7`

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