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An object moving with a speed of 6.25 m/...

An object moving with a speed of 6.25 m/s, is decelerated at a rate given by `dv/dt=-2.5sqrt v` where v is the instantaneous speed. The time taken by the object, to come to rest, would be

A

2 s

B

3 s

C

2.5 s

D

4 s

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