A river of width 120 m flows east at 3 m/s. A boat moves at 5 m/s relative to water. To reach the point directly opposite, it is pointed at angle θ upstream from the perpendicular to the bank. Then:
Options

Question

A river of width 120 m flows east at 3 m/s. A boat moves at 5 m/s relative to water. To reach the point directly opposite, it is pointed at angle θ upstream from the perpendicular to the bank. Then:

G1 Physics · Accepted Answer

For no downstream drift, the upstream component of boat velocity must equal river velocity: 5sinθ = 3. Therefore sinθ = 3/5.