赞 monecasally 幼苗
共回答了21个问题采纳率：90.5% 举报
由v=s/t可知
t空气=s/v空气=s/340m/s
t钢铁=s/v钢铁=s/5200m/s
s/340m/s—s/5200m/s=2s
s=727.6m
t空气=s/v空气=s/340m/s
t钢铁=s/v钢铁=s/5200m/s
s/340m/s—s/5200m/s=2s
s=727.6m
1年前
1
ILOVEYOUMM 幼苗
共回答了11个问题 举报
v1=340m/s, v2=5200m/s
t1,t2(t2=t1-2)
L1=L2
v1 × t1 = L1 =L2 =V2 × t2
v1 × t1 = v2 × t1 - v2×2
t1 =v2×2 ÷ (v2-v1)
t1 = 10400/4860
L1 = v1 × t1 =727.57米
t1,t2(t2=t1-2)
L1=L2
v1 × t1 = L1 =L2 =V2 × t2
v1 × t1 = v2 × t1 - v2×2
t1 =v2×2 ÷ (v2-v1)
t1 = 10400/4860
L1 = v1 × t1 =727.57米
1年前
0
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