Kinematics 3 Question 6
6. A river is flowing from West to East at a speed of $5 m / min$. A man on the South bank of the river, capable of swimming at $10 m / min$ in still water, wants to swim across the river in the shortest time. He should swim in a direction
(1983, 1M)
(a) due North
(b) $30^{\circ}$ East of North
(c) $30^{\circ}$ West of North
(d) $60^{\circ}$ East of North
Show Answer
Answer:
Correct Answer: 6. (a)
Solution:
- To cross the river in shortest time, one has to swim perpendicular to the river current.
