JAMB - Physics (1980 - No. 21)
A tugboat is travelling from Asaba to Onitsha across the River Niger with a resultant velocity of 20 knots. If the river flows at 12 knots, the direction of motion of the boat relative to the direction of water flow is?
36.87o
53.13o
90o
136o
143.13o
Giải thích
\(\theta\) = cos-1\(\frac{(12)}{20}\)
\(\theta\) = 53.13°
\(\theta\) = 53.13°