MECHANICS......
Classical Mechanics
Level
3
A BOAT MOVES RELATIVE TO WATER WITH VELOCITY K = 2 TIMES LESS THAN THE RIVER FLOW VELOCITY. AT WHAT ANGLE TO THE STREAM DIRECTION MUST THE BOAT MOVE TO MINIMIZE DRIFTING.
90
60
120
110
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1 solution
THETA=ARCSIN(1/n)+pi/2=120