The position versus time for a certain object moving along the x-axis is shown. The object’s initial position is −2 m. Find the instantaneous velocity at 1s.(adsbygoogle = window.adsbygoogle || []).push({});

http://img23.imageshack.us/img23/5285/phy1w.jpg [Broken]

Using points (0,-2) and (2,7) I found the equation of the line to be =7/2x-2. Since this is a straight line I thought the tangent line would have the same slope. So, at 1s the instantaneous velocity would be 7/2, but this is not the correct answer. Where am I going wrong?

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# Homework Help: Finding Instantaneous Velocity

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