Extracted text: 7. A particle moves along a straight line such that its position is defined by s = ( - 6t + 5) m. Determine the average velocity, the average speed, and the acceleration of the particle when t= 6 s. (Vsp)avg = 3 m/s; Ans. Vavg = 0; a -6 = 2 m/s? 8. A particle is moving along a straight line such that its position is defined by s = (10r + 20) mm, where t is in seconds. Determine (a) the displacement of the particle during the time interval from t = 1 s to t= 5