Question

船以恒定的速度v船＝0.5m/s渡河,河水的流速为v水＝0.3m/s.已知河的宽度为50m,试求：（1）船渡河的最少时间

Answer 1

1>V合=0.6M/S

S=D/SINX=50/(0.5/0.6)=60M

T=S/V合=100S

2>V合=0.6M/S

S=D/SINX=50/(0.5/0.6)=60M

3>SINX=V水/V船=0.6

S=D/SINX=250/3(M)