CIE mechanics question

[tmisterr]

if a = -5120/t^3 where t>or=5 how do find the terminal velocity? I know the equation for velocity will be the integral of that and at terminal velocity the acceleration should be 0, but i cannot solve for t by equating a to 0. any suggestions?

[astarmathsandphysics]

T will be infinity

[astarmathsandphysics]

v=2560/t^2+c
The rerminal velocity will be c - you need a value for v at any time t to fiond wjat c is.

[tmisterr]

thanks astar, i have the value for c so it worked out if u use lim---->0