The pоsitiоn functiоn of а pаrticle is described аs x(t) = 4t4 + 3t2 - 2t3 m. What is the average velocity (in m/s) between t = 2.5 s and 4.0 s? xo = [xo] m xf = [xf] m vav = [v] m/s (Show your answers up to 2 decimal places, negative answers are accepted)