Kinematics 3 Question 5

5. A boat which has a speed of 5km/h in still water crosses a river of width 1km along the shortest possible path in 15min. The velocity of the river water in km/h is

(a) 1

(b) 3

(c) 4

(d) 41

(1988, 2M)

Show Answer

Answer:

Correct Answer: 5. (b)

Solution:

  1. Shortest possible path comes when absolute velocity of boatman comes perpendicular to river current as shown in figure.

Solving this equation, we get vr=3km/h



जेईई के लिए मॉक टेस्ट

एनसीईआरटी अध्याय वीडियो समाधान

दोहरा फलक