Thread: calc question

the motion of a particle is given by the parametric equations x=t^2+t and y=3t-2. the speed of the particle at t=2 is....?
a.) 2 sq.roots of 2
b.) sq. root of 26
c.) sq. root of 34
d.) 6
e.) 2 sq. roots of 13

i got the answer 3/5 and don't understand why i'm not even close to any of these answers.

You simply require the formula:



by putting the value t=2 into both equations and using the formula above you should get the correct answer.
I'll leave you to do the calculations.

thanks i got e.) 2 sq. roots of 13