31 At the starting gun, a runner accelerates at 1.9 m/$? for 5.2s. The runner's acceleration is zero for the rest of the race. What is the speed of the runner (a) at t = 2.0 s, and (b) at the end of the race? 32. A jet makes a landing traveling due east with a speed of 70.6 m/s. If the jet comes to rest in 13.0s, what are the magnitude and direc- tion of its average acceleration? 33. ) A car is traveling due north at 23.6 m/s. Find the velocity of the car after 7.10 s if its acceleration is (a) 1.30 m/s? due north, or (b) 1.15 m/s? due south. SECTION 2-5 MOTION WITH CONSTANT ACCELERATION (40.) Landing with a speed of 71.4 m/s, and traveling due south, a jet comes to rest in 949 m. Assuming the jet slows with constant acceleration, find the magnitude and direction of its acceleration