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Physics - Kinematics Question with Solution | TestHub

PhysicsKinematicsRelativeMedium2 minQB

PhysicsMediuminteger

A river flows at 1 km/hr. A swimmer swims at 5 km/hr at $5 3^{\circ}$ to the river and lands at $C$ with $A B = BC = 400$ m ( $B$ directly opposite $A$ ). Find the time taken to reach $C$ in minutes.

Answer:

Solution:

$cos θ = 3/5$ , so the across component is $5 \times 4/5 = 4$ km/hr and the along-river component is $5 \times 3/5 + 1 = 4$ km/hr; the resultant is $42$ km/hr along $A C = 4002$ m. $t = 0.4 2 /4 2 = 0.1$ hr = $6$ min. Answer: 6.

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: QB

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