# Calculate Instantaneous Velocity at t=2s

## The Attempt at a Solution

I tried to find the slope of the tangent line, but this gave me 3.66 and the answer is 3.8 how do I find this?

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Merlin3189
Homework Helper
Gold Member
First, for the graph you've given us, I don't think you could be expected to do any better.

Second, but what numbers did you use? It looks like your tangent crosses the time axis at 3.5sec and the distance axis at over 13, so 13/3.5 = 3.71 should be lower than your answer? Their suggestion of 3.8 looks like 13.3/3.5 and I can estimate the distance intercept between13.26 and 13.33 or even 13.4 (a pixel or two on my copy!)

First, for the graph you've given us, I don't think you could be expected to do any better.

Second, but what numbers did you use? It looks like your tangent crosses the time axis at 3.5sec and the distance axis at over 13, so 13/3.5 = 3.71 should be lower than your answer? Their suggestion of 3.8 looks like 13.3/3.5 and I can estimate the distance intercept between13.26 and 13.33 or even 13.4 (a pixel or two on my copy!)
your copy is as good as mine I forget the exact numbers I used but I was hoping there would be a different way to go about it other than eyeballing it.