Secant method to find root

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Ryan Elway 2017-9-20

评论： Walter Roberson 2017-9-20

I need to find how long it will take to find an object to hit the ground using secant method.

The equation is

y=(1/k)ln[cosh(t*sqrt(gk))]

while g = 9.81 and k = .00341 t = time in seconds and y is in meters

I need to determine how much time (t) it will take to fall 1000 meters to within 1cm.

Here is what I have which is way off I'm guessing:

clc;
deff('y = f(x)','1000-(1/k)*log(cosh(t*sqrt(gk)))');
t = linspace(0,10,1000)
g = 9.81;
k = .00341;
plot(t,f(x));
r = fsolve(0,f);
disp(r);

Walter Roberson 2017-9-20

What is deff() ?

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