wiz-icon
MyQuestionIcon
MyQuestionIcon
1
You visited us 1 times! Enjoying our articles? Unlock Full Access!
Question

A river is flowing with a speed of 1 kmhr. A swimmer wants to go to point 'C' starting from 'A'. He swims with a speed of 5kmhr, at an angle θ w.r.t. the river. If AB = BC = 400 m. Then:

A
The value of θ is 53
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
B
Time taken by the man is 6 min
Right on! Give the BNAT exam to get a 100% scholarship for BYJUS courses
C
Time taken by the man is 8 min
No worries! We‘ve got your back. Try BYJU‘S free classes today!
D
The value of θ is 45
No worries! We‘ve got your back. Try BYJU‘S free classes today!
Open in App
Solution

The correct option is B Time taken by the man is 6 min

AB = BC = 400 m = 0.4 km
vx=5 cos θ+1
vy=5 sin θ
time taken (t)=ABvy=BCvx
vy=vx5 sin θ=5 cos θ+1
θ=53
and t=0.45 sin (53)=0.1 hr=6 min.

flag
Suggest Corrections
thumbs-up
0
Join BYJU'S Learning Program
similar_icon
Related Videos
thumbnail
lock
PHYSICS
Watch in App
Join BYJU'S Learning Program
CrossIcon