The position of a particle is given by r=2.00t^3i + (t^2-1.00)j where [t]=s and [r]=m. Find the magnitude of the velocity of this particle at time t=1.20s.
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plug in 1.2s to get r in m. then since you know velocity=m/s divide the distance travelled by time. or you can try taking the derivative to get velocity and then plug in your time to directly get it :)
I did it by taking the derivative and plugging the time in....I got 8.75m/s but I then did i the first way and got 2.90m/s....which is right?
i think it is the second way sry the first way cant work like that. i only looked at the numbers to come up with a solution i read it. it should b the second way :)