乙追上甲的时候乙跑了t+1/2×1.2t²=t+1/2×0.5t²+100,解得t=20根号下5/7≈16.9
下个整秒是17
乙比甲多跑=t+1/2×1.2t²-t+1/2×0.5t²+100 t=17,解得
=190.4-189.25=1.15米
乙追上甲的时候乙跑了t+1/2×1.2t²=t+1/2×0.5t²+100,解得t=20根号下5/7≈16.9
下个整秒是17
乙比甲多跑=t+1/2×1.2t²-t+1/2×0.5t²+100 t=17,解得
=190.4-189.25=1.15米