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A car travelling at 20 metres/sec^(-1) has brakes that can give a negative acceleration of 5metres/second^(-2). How long will it take for the car to stop?

I would like to ask which publishers are happy to publish the following type: Thriller/Action/Mystery category. Is there any? I'd prefer answers from people from Sydney because I live in that general area. Another is, crudely, how much would it cost me? How much could I possibly earn as a...