第一段是勻加速運(yùn)動(dòng),s1=0.5at1^2 = 0.5 * 1 * 5^2 = 12.5m
第二段勻速,v = at1 = 1 * 5 = 5 m/s,s2 = v * t2 = 5 * 4 = 20m
第三段勻減速運(yùn)動(dòng)a' = v/t3 = 5/2=2.5 m/s^2
s3 = 0.5 a' t3^2 = 0.5 * 2.5 * 2^2 = 5m
所以s=s1+s2+s3 = 37.5m
都是基本公式,lz需要努力