Question

import java.util.Scanner;
public class Lab9Q3
{
public static void main (String [] atgs)
{
double mass;
double velocity;
double totalkineticEnergy;
  
Scanner keyboard = new Scanner (System.in);
System.out.println ("Please enter the objects mass in kilograms");
mass = keyboard.nextDouble();
  
System.out.println ("Please enter the objects velocity in meters per second: ");
velocity = keyboard.nextDouble();
  
double actualTotal = kineticEnergy (mass, velocity);
System.out.println ("Objects Kinetic Energy: " + actualTotal);
}
public static double kineticEnergy (double mass, double velocity)
{
double totalkineticEnergy = ((mass * velocity * 2)/2); //This is my issue
return totalkineticEnergy;
}
}

My current code is able to be compiled, however I am trying to find the kinetic energy of an object using the formula KE = ½ mv² my code is only multiplying mass * velocity my overall question is how do I fix this to fit the equation and give me the correct answer.

Using JAVA

Answer 1

Corrected code is given below.change made is shown in bold case.Screen shot of the code and output are also attached.If find any difficulty, feel free to ask in comment section. Please do upvote the answer.Thank you.

Error in the code

• Kinetic energy is calculated using the formula KE = ½ mv²
• In the given code, totalkineticEnergy = ((mass * velocity * 2)/2);
• Here instead of finding square of velocity.It's double is calculated
• velocity * 2 produce double of velocity
• Then the division by 2,finally gives a result which just the product of mass and velocity
• Code can be corrected by replacing velocity*2 by velocity*velocity,which is the square of velocity.

Corrected code

import java.util.Scanner;
public class Lab9Q3 {

    public static void main(String[] args) {
        double mass;
        double velocity;
        double totalkineticEnergy;

        Scanner keyboard = new Scanner (System.in);
        System.out.println ("Please enter the objects mass in kilograms");
        mass = keyboard.nextDouble();

        System.out.println ("Please enter the objects velocity in meters per second: ");
        velocity = keyboard.nextDouble();

        double actualTotal = kineticEnergy (mass, velocity);
        System.out.println ("Objects Kinetic Energy: " + actualTotal);
    }
    public static double kineticEnergy (double mass, double velocity)
    {
        double totalkineticEnergy = ((mass * velocity * velocity)/2); //Issue corrected
        return totalkineticEnergy;
    }
}

Screen shot of the code and output