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Help with instantaneous velocity 
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#1
Sep604, 03:53 PM

P: 42

I was given the following graph:
http://www.webassign.net/pse/p203.gif I must find the instantaneous velocity at T=1.4 The formula for instantaneous velocity is delta x/delta t as t approaches zero. However, I'm still not sure how to work this problem. Please help 


#2
Sep604, 04:09 PM

P: 1,367

Find the equation for x(t) in the interval t = [0,2]. You should know the velocity by then.



#3
Sep604, 05:13 PM

Sci Advisor
PF Gold
P: 9,485

The formula you gave is for instantaneous acceleration, not velocity. So I will assume you are looking for instantaneous acceleration.
You will note the graph is a straight line from 0  2 seconds which means the acceleration is constant. The instantaneous acceleration is therefore the same as the average acceleration over that interval. 


#4
Sep604, 06:41 PM

P: 42

Help with instantaneous velocity
No, its instantaneous velocity that I'm looking for. I thought instantaneous acceleration is the change in velocity over the change in time.



#5
Sep604, 07:10 PM

P: 112

Since it is a straight line though, the velocity is not changing, so you can just find the instantaneous velocity by finding the slope of the 02 second interval(since t = 1.4 has the same velocity as that interval) 


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