(3分钟3*60s=180s
20m/s*180s=3600m
3600m+1000m=4600m)
0.5*a*t1=x1
a*t1=30m/s
30m/s*t2=x2
x1+x2=4600m
t1+t2=180s
t1=800/15s
t2=(180-800/15)s
a=9/16m/s^2
(3分钟3*60s=180s
20m/s*180s=3600m
3600m+1000m=4600m)
0.5*a*t1=x1
a*t1=30m/s
30m/s*t2=x2
x1+x2=4600m
t1+t2=180s
t1=800/15s
t2=(180-800/15)s
a=9/16m/s^2