30. A woodchuck runs 20 m to the right in 5 s, then turns and runs 10 m to the left in 3 s. (a) What is the average velocity of the woodchuck? (b) What is its average speed?31. Sketch the velocity-versus-time graph from the following position-versus-time graph.32. Sketch the velocity-versus-time graph from the following position-versus-time graph.33. Given the following velocity-versus-time graph, sketch the position-versus-time graph.34. An object has a position functionx(t)=5t m. (a) What is the velocity as a function of time? (b) Graph the position function and the velocity function.35. A particle moves along the x-axis according tox(t)=10t-2t2 m. (a) What is the instantaneous velocity at t = 2 s and t = 3 s? (b) What is the instantaneous speed at these times? (c) What is the average velocity between t = 2 s and t = 3 s?36. Unreasonable results. A particle moves along the x-axis according tox(t)=3t3+5t. At what time is the velocity of the particle equal to zero? Is this reasonable?
