- #1
KiNGGeexD
- 317
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I was given an example in a lecture of a vector question which is typical of this module.
Question
The position of mass m is described as a vector r, from an origin such that r= 7t i + (4t-3t^2) j metres.
Find the magnitude and directions of r and dr/dt when dy/dt=0Now I have worked through this and know what to do but when I looked at the model answer I noticed what to me looks like a mistake?
I've attached the solution done by my lecturer but he deduces when 4t-3t^2 = 0
That t=2/3 which it can't be it has to be 4/3?I'm not sure if I am mistaken that's why I'm asking and if I am wrong I would like to know why:) thanks guys:)
Question
The position of mass m is described as a vector r, from an origin such that r= 7t i + (4t-3t^2) j metres.
Find the magnitude and directions of r and dr/dt when dy/dt=0Now I have worked through this and know what to do but when I looked at the model answer I noticed what to me looks like a mistake?
I've attached the solution done by my lecturer but he deduces when 4t-3t^2 = 0
That t=2/3 which it can't be it has to be 4/3?I'm not sure if I am mistaken that's why I'm asking and if I am wrong I would like to know why:) thanks guys:)