h=1/2gt^.设h1=4.9cm.h2=9.8cm.h3=14.7cm.
hi:h2:h3=t1^:t2^:t3^
4.9:9.8:14.7=^t1^:t2^:t3^
1:2:3=^t1^:t2^:t3^
1:√2:√3=^t1^:t2^:t3^
所以正确
h=1/2gt^.设h1=4.9cm.h2=9.8cm.h3=14.7cm.
hi:h2:h3=t1^:t2^:t3^
4.9:9.8:14.7=^t1^:t2^:t3^
1:2:3=^t1^:t2^:t3^
1:√2:√3=^t1^:t2^:t3^
所以正确