The Rocket Problem

127 days ago by gregbard

a(t) = 20*exp(-0.05*t) - 9.8 
       
almost_v(t) = integral( a(t), t) 
       
almost_v(t) 
       
-9.8*t - 400.0*e^(-0.05*t)
-9.8*t - 400.0*e^(-0.05*t)
almost_v(0) 
       
-400.0
-400.0
v(t)=almost_v(t) + 400 
       
v(t) 
       
-9.8*t - 400.0*e^(-0.05*t) + 400
-9.8*t - 400.0*e^(-0.05*t) + 400
almost_h(t) = integral( v(t), t) 
       
almost_h(t) 
       
-4.9*t^2 + 400*t + 8000.0*e^(-0.05*t)
-4.9*t^2 + 400*t + 8000.0*e^(-0.05*t)
almost_h(0) 
       
8000.0
8000.0
h(t)=almost_h(t)-8000 
       
h(t) 
       
-4.9*t^2 + 400*t + 8000.0*e^(-0.05*t) - 8000
-4.9*t^2 + 400*t + 8000.0*e^(-0.05*t) - 8000
find_root(v(t)==0, 1, 100) 
       
32.963065202764675
32.963065202764675
h(_) 
       
1400.30333031
1400.30333031
find_root(h(t)==0, 1, 100) 
       
53.007513640052935
53.007513640052935
v(_) 
       
-147.723503935
-147.723503935
plot(a(t),0,53) 
       
plot(v(t),0,53) 
       
plot(h(t),0,53) 
       
j(t)=derivative(a(t), t) 
       
j(t) 
       
-e^(-0.0500000000000000*t)
-e^(-0.0500000000000000*t)
plot( j(t), 0, 53)