velocity of a rocket (bisection root finding)

I am completely at a loss. Any suggestions are appreciated. I am not looking for the answer, just something to get me started since I'm confused.

I have started one string but I am not sure how using the 750 comes into play. Thanks -

myFunction = @(x) (1800*(log(160000/(160000-(2600*x)))))-(9.812*x);

x_lower = 749;
x_upper = 751;

x_mid = (x_lower + x_upper)/2;

counter = 1;

while abs(myFunction(x_mid)) > (1*(10^(-4)))
    if (myFunction(x_mid) * myFunction(x_upper)) < 0
        x_lower = x_mid;
    else
        x_upper = x_mid;
    end
    x_mid = (x_lower + x_upper)/2;

      counter = counter + 1;

end

fprintf('The root is %.7f\n', x_mid);
fprintf('Number of iterations done: %g\n', counter)

Answer 1

[Walter Roberson]

myFunction = @(x) (1800*(log(160000/(160000-(2600*x)))))-(9.812*x) - 750;

and you will want to change your starting x values.