In a world where change is the only constant, a Plan B -- and C, D, and E -- is truly critical.

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Immediately after the collision, a constant braking force of magnitude 250 N is applied to C.

BBC: Colleges despair at exam board 'error'

With a constant need to upgrade technology, advertise its brand and adjust its worldwide branch network, Citi (nyse: C - news - people ) continues to struggle with keeping expense growth below revenue growth.

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