A taxi without any passengers, moving on...

A taxi without any passengers, moving on a frictionless horizontal road, with a velocity u can be stopped in a distance d. Now the passengers and 40% to its weight. What is the stopping distance at veolcity u, if the retardation remains the same?

1.4 s

`sqrt 1.4s`

`(1.4)^2s2

`/1.4s`

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