A particle moves along the x axis according to the equation x = 50t + 10t2, where x is in meters and t is in seconds. (a) Calculate the average velocity of the particle during the first 3.0 s of its motion. ? m/s (b) Calculate the instantaneous velocity of the particle at t = 3.0 s. ? m/s (c) Calculate the instantaneous acceleration of the particle at t = 3.0 s. ? m/s2