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% whileloop.m

% In order to find the time of flight for the ball.

% Assume the ball is thrown with a slightly lower initial velocity-4.5 m/s,

% while everhting else is kept unchanged.

% find the time when heights start to get negative, i.e. when the ball

% cross y = 0.

g = 9.81;

v0 = 4.5;

t = linspace(0, 1, 1000);

y = v0 * t - 0.5 * g * t.^2; % generate all heights

i = 1;

while y(i) >= 0

i = i + 1;

end

fprintf('The time (switch from positive to negative): %f\n', t(i));

plot(t, y);

xlabel('Time (s)');

ylabel('Height (m)');