MATLAB: How can i solve this equation for t , knowing all other variables

Question

d_ball=147*10^-3;%m
mass=1.52;%kg
g=9.81;
Cd_sphere=1; %!!
rho=1.225;
area=pi*(d_ball^2);
k=(Cd_sphere*rho*area)/(2*mass);
y=0:1:150;
V=25;
N=g./k;
Q=g./(k.^2);
(N.*t)-(Q.*(1-exp(-k*t)))-y=0

Answer 1

Hi

this is John BG ( <mailto:jgb2012@sky.com jgb2012@sky.com> )

the plot of

y = @(t) (N.*t)-(Q.*(1-exp(-k.*t)));

shows that the only zero of t is t=0

trying smaller t windows

 t=[-.1:1e-4:.1];p = (N.*t) - (Q.*(1 - exp(-k*t))) - y;plot(t,p)
 t=[-.001:1e-6:.001];p = (N.*t) - (Q.*(1 - exp(-k*t))) - y;plot(t,p)

there are no such t>0 and t<0 zeros.

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thanks in advance

John BG

<mailto:jgb2012@sky.com jgb2012@sky.com>