Answer:

What kind of loop will be used? A counting loop, since t will increase until it hits a limit.
What is the loop control variable? Time, t, since it is increased, second by second.
What does the loop body do? It calculates distance for the current value of t , then increases t.

Gravity Program Skeleton

The program looks like this:

import java.util.Scanner;

// User picks ending value for time, t.
// The program calculates and prints 
// the distance the brick has fallen for each t.
//
class FallingBrick
{
  public static void main (String[] args ) 
  {
    final  double G = 9.80665;  // constant of gravitational acceleration
    int    t, limit;            // time in seconds; ending value of time
    double distance;            // the distance the brick has fallen
    Scanner scan = new Scanner( System.in );

    System.out.print( "Enter limit value: " );
    limit = scan.nextInt();

    // Print a table heading
    System.out.println( "seconds\tDistance"  );  // '\t' is tab
    System.out.println( "-------\t--------"  ); 

    t =  ;
    
    while (  )    
    {
      (more statements will go here later.)

      t = 
    }

  }
}

QUESTION 15:

First get the loop correct. Three things must be coordinated: Time starts at zero, is increased by one second each time, and when time equals limit the last value is printed out.