[填空题]
Estimate the average acceleration of the car in the prev1svo tcpklqcv: dt6*r) 0fz.3 ious Problem o)c/17xvhm m qww u0.l(Fig. 2–35) when .71w/hucqm )xvo lw0m it is in
(a) first, $m/s^2$
(b) third, $m/s^2$
(c) fifth gear. $m/s^2$
(d) What is its average acceleration through the first four gears? $m/s^2$