Chapter 2 Question 2.9, Introduction to Java Programming, Tenth Edition Y. Daniel LiangY.

(Physics: acceleration) Average acceleration is defined as the change of velocity divided by the time taken to make the change, as shown in the following formula: 

a = v1 - v0/ t 

Write a program that prompts the user to enter the starting velocity v0 in meters/ second, the ending velocity v1 in meters/second, and the time span t in seconds, and displays the average acceleration. 

Solution

import java.util.Scanner;

public class Exercise_02_09 {

    public static void main(String[] args) {

        Scanner input = new Scanner(System.in); // Create a Scanner object

        // Prompt the user to enter the starting velocity v0 in meters/second.

        // The ending velocity v1 in meters/second, and the time span t in seconds.

        System.out.print("Enter v0, v1 and t: ");

        double v0 = input.nextDouble();

        double v1 = input.nextDouble();

        double t = input.nextDouble();

        // Calculate the average acceleration

        double a = (v1 - v0) / t;

        // Display result

        System.out.println("The average acceleration is " + a);

    }

}