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Physics - Kinematics Question with Solution | TestHub

PhysicsKinematicsRelativeMedium2 minQB

PhysicsMediumsingle choice

Passage / Comprehension

Kids enjoy running up and down escalators in departmental stores, especially in the wrong directions as shown in the diagram. Consider an escalator going down an incline at a speed $V = 0.4 m / sec$ with steps that are $Δ L = 0.3 m$ apart. The full length of the escalator is $L = 16 m$ .

Suppose a kid can run down the length of the escalators in $\frac{1}{3}$ of the time that it takes to run up the escalator but his running speed $V_{r}$ relative to the escalators steps is the same in each case. What is his running speed $V_{r}$ :-

Options:

Answer:

Solution:

$\frac{16}{V + 0.4} = \frac{1}{3} (\frac{16}{V - 0.4})$

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: QB

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