Car A moving along a straight horizontal...

Car A moving along a straight horizontal road with a velocity 60 `"km.h"^(-1)` is followed by car B moving with a velocity 70 `"km.h"^(-1)`. When car B is at a distance 2.5 km from car A car B applies a retardation of 20 `"km.h"^(-2)`. Where and when will the two cars meet?

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The correct Answer is:

32.5 km, `(1)/(2)` h

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