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Student Support Forum: 'Why does solve output an empty list?' topicStudent Support Forum > General > Archives > "Why does solve output an empty list?"

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LeoDo
06/23/13 11:09am

Hi!

I am trying to find the crossing point between to point particles on linear paths:

Here's what I enter:


particle1 = {x0 + vx*t, y0 + vy*t}

particle2 = {X0 + VX*t, Y0 + VY*t}

toSolve = Solve[particle1 == particle2, t]

Already here, Mathematica informs me that there will never be a solution:

Out[]={}

No more luck entering specific values:

toSolve /. {x0 -> 0, vx -> 1, y0 -> 0, vy -> 0, X0 -> 5, VX -> -1,
Y0 -> 0, VY -> 0}

Out[]={}

Here, the two particles should meet after 2.5 seconds at midpoint on the x axis. Particle One launches from the origin in x-Direction at speed 1, particle Two starts off at point (5,0) and travels at speed -1 in the x direction.

What am I doing wrong?

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Subject (listing for 'Why does solve output an empty list?')
Author Date Posted
Why does solve output an empty list? LeoDo 06/23/13 11:09am
Re: Why does solve output an empty list? jf 06/23/13 12:34pm
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