mu = 398600; % Earth’s gravitational parameter [km^3/s^2]
R_earth = 6378; % Earth radius [km] % Plot the speed and period of a satellite in circular LEO as a function % of altitude % Low Earth orbit(LEO) h = 160:1:2000; %[km] v = (mu./(R_earth+h)).^0.5; %[km/s] T = 2*pi*(R_earth+h).^1.5/mu^0.5; %[s] T = T/60; %[min] % Plots figure(1); hold on;grid on; plot(h,v); xlabel('Altitude [km]'); ylabel('Speed [km/s]'); title('Circular orbital speed as a function of altitude,LEO'); figure(2); hold on;grid on; plot(h,T); xlabel('Altitude [km]'); ylabel('Period [min]'); title('Circular orbital period as a function of altitude,LEO');
Small Satellites 
Why is h = 160:1:2000; can we not enter a single h value, eg the height is 200km for example? what do the extra terms mean?
Sorry for a late replay. Lately I was quite busy with other projects and did not get much time to contribute.
Yes of course you can enter a single vale. If you simply put h = 200 it shall give you the answer. you can delate plotiing and extras as you do not need it. hope it helps !