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Physics - Kinematics Question with Solution | TestHub

PhysicsKinematicsRelativeHard2 minQB

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Some persons hire a boat for 4 hours. The river flows at a speed of 5 km/hr and the boat moves with speed of 15 km/hr relative to the water. How far along the flow direction, they can go if they have to return in 4 hrs.

Options:

Answer:

Solution:

$(u + v) t = (v - u) (4 - t)$

$20 t = 10 (4 - t) ∴ t = \frac{4}{3} hrs . ∴ x = 20 \times \frac{4}{3} = \frac{80}{3} km$

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: QB

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