science
Grade-11
Easy
Question
If the river's width is 10 m and the angle of the drift is 60 degrees, the velocity of the person on the boat concerning the river is 4 m/s. Find the time taken by to cross the river.
- 2.3
- 3.1
- 2.9
- 5.2
Hint:
2.9 s
The correct answer is: 2.9
Given:
The velocity of the person on a boat (Vp) = 4ms-1
Angle of drift (θ) = 60ο
Width of the river (d) = 10m
To find:
Time taken (t) = ?
Solution:
![S i n theta space equals space P over H space
S i n 60 space equals space fraction numerator 10 space over denominator H end fraction
H space equals space fraction numerator 10 over denominator begin display style fraction numerator square root of 3 over denominator 2 end fraction end style end fraction space equals space 11.7 m space left parenthesis space d i s tan c e space c o v e r e d space b y space t h e space p e r s o n right parenthesis space
B y space u sin g comma
s p e e d space equals fraction numerator space D i tan c e space over denominator t i m e end fraction
T i m e space t a k e n space equals space fraction numerator 11.7 over denominator 4 end fraction space equals space 2.9 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Answer:
Time taken to cross the river = 2.9s
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