①t=s/v=3×10^8米/3×10^8米/秒=1秒;
②s=32m-22m=10m,v=s/t=10m/5s=2m/s;
③t=1s+3s+1s=5s,s=5s*2m/s=10m,s=32m-3*10m=2m