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Qualification => Reference Material => GCE AS & A2 Level => Pastpapers => Topic started by: tmisterr on January 13, 2010, 04:00:40 pm

Title: CIE mechanics question
Post by: tmisterr on January 13, 2010, 04:00:40 pm

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???????

Title: Re: CIE mechanics question
Post by: astarmathsandphysics on January 13, 2010, 04:44:52 pm

T will be infinity

Title: Re: CIE mechanics question
Post by: astarmathsandphysics on January 13, 2010, 07:21:02 pm

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.

Title: Re: CIE mechanics question
Post by: tmisterr on January 14, 2010, 04:57:13 pm

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