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## #1 2011-08-17 17:56:12

model
Full Member

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### Displacement and Velocity

Hi all,

Say my finger location is x1 = 236 , y1 = 105 , x2 = 126, y2 =123 .

where
x1.y1 ==> current location and
x2,y2==> previous location

And i have distance computed using
dis = sqrt( (x2-x1)^2 - (y2-y1)^2 )
say angle is 60 degree .

Now, How far my finger move w.r.t its angle and what is its spead at given time 1sec ???? ?

Maths is Doctor that make our life easy ..

## #2 2011-08-17 18:33:06

bob bundy
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### Re: Displacement and Velocity

hi model,

I've made a diagram from what you have posted.  see below.

It is NOT accurately to scale.  But I have calculated the angles accurately using those co-ordinates.

No 60 degrees.  Where does that come from?

And where does 1 sec come from?  Is this the time taken to move from the previous location to the current location?

I'm not sure what you want help with.

Bob