Answer:
import java.util.*;
public class Country
{
public static void main(String args[])
{
char ch,temp;
int flag = 0;
String country;
ArrayList<String> countries = new ArrayList<String>();
Scanner sc = new Scanner(System.in);
do
{
System.out.println("enter the country you have visited:\t");
country = sc.next();
for(int i=0;i<countries.size();i++)
{
if(countries.get(i).equals(country))
{
System.out.println("you have already entered the country");
flag = 1;
break;
}
}
if(flag == 0)
{
countries.add(country);
flag = 0;
}
System.out.println("want to add another country(y/n):\t");
ch = sc.next().charAt(0);
}while(ch!='n');
Collections.sort(countries);
System.out.println("Countries you have visited:\t"+countries);
System.out.println("Total number of contries visited:"+countries.size());
}
}
Explanation:
Answer:
First of all,there is not theory F=ma^2!!
Its F=ma and they are definitely not the same.Here F means force and E means Energy.
a means acceleration, but c means the velocity of light. Clearly there's difference between acceleration and velocity and force and energy.
F=ma can be applied on things we normally see but E=mc^2 is applied on things that can travel nearly in light speed!which means atoms,molecules, protons,electrons etc. energy can be determined by the Einstein theory but F=ma is for determining human energy, or energy of cars,vehicles or any regular moving things
Explanation:
