### Home > CALC > Chapter 12 > Lesson 12.2.2 > Problem 12-83

12-83.

**Multiple Choice:**A particle moves in the plane according to the equations*x*(*t*) = cos*πt*and*.*What is the magnitude of the velocity vector at? Homework Help ✎ 0

Sketch this vector, then use the Pythagorean Theorem to determine its magnitude.