Question 203: Motion in 2D & Vectors

Question

The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river in shortest time 15 min. Then the velocity of river stream is

Accepted Answer

$${v_{{\mathop{m Resultant}
olimits} }} = {{1\,km} \over {1/4\,hr}} = 4\,km/hr$$
$$ 	herefore $$ $${v_{River}} = \sqrt {{5^2} - {4^2}}  = 3\,km/hr$$

Answer

3 km/hr

Answer

4 km/hr

Answer

$$\sqrt {29} $$ km/hr

Answer

$$\sqrt {41} $$ km/hr.

Motion in 2D & Vectors

The width of river is 1 km. The velocity of boat is 5 km/hr. The boat covered the width of river in shortest time 15 min. Then the velocity of river stream is

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