【答案】⑴速度图像如图(略).⑵ 900m
2m/s2 X 10s=20m/s
(20m/s2)2/2 X 2m/2=100m
20m/s X 30s=600m
20m/s X 20s-1/2 X 1m/s2 X (20s)2=200m
S总=100m+600m+200m=900m
【答案】⑴速度图像如图(略).⑵ 900m
2m/s2 X 10s=20m/s
(20m/s2)2/2 X 2m/2=100m
20m/s X 30s=600m
20m/s X 20s-1/2 X 1m/s2 X (20s)2=200m
S总=100m+600m+200m=900m