Books are out best friends. They give us both knowledge and pleasure. With books, our life is interesting.84．Books are so great friends of ours that we can turn to them for help whenever we meet with difficulty.

However, we should make use of books. As there are bond of different kinds, we should read them in different ways.．In my opinion, some books are to be read carefully and we must think over and learn something from them. Some should be just looked through. There are a few books that we should never read, for they are not good for us.85．The most important thing that we must try to put what we learn from books to practice.

下表列出某种型号轿车的部分数据，根据表中数据可知：该车以最大功率和最高速度在水平路面上行驶时所受阻力的大小是____________N；假定轿车所受阻力恒定，若轿车保持最大功率行使，当轿车载重200kg、速度达到10m/s时，加速度为____________m/s²。