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A boat is rowed across a river at the rate of 4.5km/hr.The river flows at the rate of 6km/hr. The velocity of boat in m/s is

A boat is rowed across a river at the rate of 4.5km/hr.The river flows at the rate of 6km/hr. The velocity of boat in m/s is 

Grade:12th pass

2 Answers

Khimraj
3007 Points
5 years ago
the angle between velocity of boat and river is 90
then resultant velocityof boat = \sqrt{4.5^{2} + 6^{2}} = 7 km/hr = 27m/s
Hope it clears..................................
Pranav Mandlik
18 Points
5 years ago
Speed of boat across river is 4.5kmph . So direction is towards north.
Speed of river is 6kmph towards east or west.
So net velocity is vector addition of both these velocity vectors
√4.5^2+6^2=√42.25=7.5kmph at 37 with horizontal
 
So by Pythagoras theorem
√ 

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