The ratio of displacement s I: s II: s III in the first second, the second and the third seconds of a free falling body=______ The velocity ratio V1: V2: V3 at the end of 1s, 2S and 3S=______ ．

The ratio of displacement s I: s II: s III in the first second, the second and the third seconds of a free falling body=______ The velocity ratio V1: V2: V3 at the end of 1s, 2S and 3S=______ ．

The displacement in the first second is Si = 12g × 12 = 5m; the displacement in the second second is SII = 12g × 4-12 × g × 1 = 15m; the displacement in the third is s Ⅲ = 12g × 9-12g × 4 = 25m; so: s Ⅰ: s Ⅱ: s Ⅲ = 1:3:5 & nbsp; & nbsp; can be obtained from v = gt; at the end of 1s, at the end of 2S, at the end of 3S, the velocity ratio V1: V2: V3 & nbsp; 1:2:3