题目

Eat your vegetables. Wash your hands. Always say “please and“thank you. We are full of advice for our children, but when it comes to money, we often have little to say. As a result, our children may grow up with clean hands and good manners, but without any idea how to manage their money. Here are some basics that will help guide them their entire lives： Show them the future. If your 13-year-old girl were to save＄1,000，invest（投资）it at 8%and add＄100 every month，by the time she's 65，she would have＄980,983！ Be careful of credit（信用）．Credit cards can help you b（6分）下图为我国拥有完全自主知识产权的一种越野车，其越野性能公认已经超越了“悍马”，坦克能去的地方它都能去，最大速度达100 km/h。当越野车匀速爬上一高14 m，长20 m的陡坡时，机械效率为70%（g取10 N/kg，汽车的质量按3650 kg计算）。求：（1）越野车受到的重力；（2）越野车以最大速度行驶50 km所需的时间；（3）越野车爬坡时的牵引力。