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.书写C#控制台应用程序，创建一个对象类，其中PhysicalObject，重量和体积，通过公有属性来訪问其重量、体积、密度。并通过公有方法来推断该物体是否会在水中下沉。提示：(1)浮力计算公式：ρ物＞ρ液，下沉，G物＞F浮　　 ρ物=ρ液，悬浮，G物=F浮（基本物体是空心的）　　 ρ物＜ρ液。上浮，（精巧后漂浮）G物＜F浮　　　 (2)纯水的密度是1k/cm3,一克每立方厘米，1升水的重量为1kg. (3)比重(ρ)=物体的重量/物体的体积 3.编写C#控制台应用程序，对第2题进行扩展。从PhysicalObject中派生出移动物体类MovingObject，在当中添加物体的速度信息，并实现物体动量和动能的计算。

提示：动量计算公式p=m*v（物体质量*速度）动能计算公式p=m*v*v/2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;

namespace Testfive
{
    class Program
    {
        static void Main(string[] args)
        {
            PhysicalObject phy = new PhysicalObject(30, 60);
            Console.WriteLine("重量：" + phy.getweight());
            Console.WriteLine("体积："+phy.getvolume());
            Console.WriteLine("密度：" + phy.midu());
            phy.panduan();
            MovingObject move = new MovingObject(30,20,50);
            Console.WriteLine("动量：" + move.dongliang());
            Console.WriteLine("动能：" + move.dongneng());
            Console.ReadKey();
        }
    }
    class PhysicalObject
    {
        private double weight;
        private double volume;
        public PhysicalObject()
        {

        }
        public PhysicalObject(double weight, double volume)
        {
            this.weight = weight;
            this.volume = volume;
        }
        public double getweight()
        {
            return weight;

        }
        public double getvolume()
        {
            return volume;
        }
        public double midu()
        {
            return weight / volume;
        }
        public void panduan()
        
        {
            if (midu() > 1)
            {
                Console.WriteLine("会下沉！
");

            }
            else
            {
                Console.WriteLine("不会下沉！
");
            }
        }


    }
    class MovingObject : PhysicalObject
    {
        private double speed;
        public MovingObject()
        { 
        
        }
        public MovingObject(double weight, double volume, double speed):base(weight,volume)
        {
            this.speed = speed;
        }
        public double dongliang()
        {
            return getweight() * speed;
        }
        public double dongneng()
        { 
            return getweight()*speed*speed*0.5;
        }
    }
}