1.(1)A:x=vt;A':x'=v't(2)略(3)略2.v0=10m/s,谨唯a=0.2m/s^2,t=30s,根据祥姿培s=v0t+at^2/2,算得坡路的长册薯度s=390m;根据vt=v0+at,算的列车到达坡底时的速度vt=16m/s3.v0=18m/s,t=3s,s=36m,由s=v0t+at^2/2,得a= -4m/s4.已知两个物体初速度为0,设位移之比为s1/s2,那么s1/s2=(a1/a2)t^2/2,则加速度之比a1/a2=(s1/s2)(2/t^2)5.(1)30m (2)10s~20s (3)驾离出发点:0~10s;驾向出发点:20s~40s
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