[填空题]
A certain type of au-e8mfb,cv*lgl/p 2f ky)t w 2ttofx6v 1yw )gh3 sd3iq/qmobile can accelerate approximately as shown in the velocity–time graph of Fig. 2–35. (The short flat spots in the cuh3/x1 3q)vfiws6y dqg rve represent shifting of the gears.)
(a) Estimate the average acceleration of the car in second gear and in fourth gear. The average acceleration in $2^{nd}$ gear is given by $m/s^2$ The average acceleration in $4^{th}$ gear is given by $m/s^2$
(b) Estimate how far the car traveled while in fourth gear. m
