7 A particle moves along a line so its position at any time z in seconds is 5(1) = 13- 712 +114-2.5. a Find the velocity and acceleration of the particle at any time f. Calculus b Find the times when the particle is at rest. c Find the times when the particle is: i speeding up ii slowing down. d Find the values of t when the particle changes direction. e Find the total distance travelled in the first 3 seconds