ls有点错误吧- -,反应的0.5s车速不变,没有V1这么一说.
v=120km/h=120000m/3600s=100/3m/s
t=0.5s内汽车位移S1=vt=50/3=16.67m,v^2=2aS2 S2=v1^2/2a 解得S2=(1250/9)=138.89m
S=S1+S2=156m
要分数的话:S=50/3+1250/9=(1400/9)m
ls有点错误吧- -,反应的0.5s车速不变,没有V1这么一说.
v=120km/h=120000m/3600s=100/3m/s
t=0.5s内汽车位移S1=vt=50/3=16.67m,v^2=2aS2 S2=v1^2/2a 解得S2=(1250/9)=138.89m
S=S1+S2=156m
要分数的话:S=50/3+1250/9=(1400/9)m