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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 $L = 16 m$ .

If his running speed relative to the escalator steps is $V_{f} = 1.2 m / sec$ , how many steps do he pass on the way up the escalator?

Options:

Answer:

Solution:

$V_{m / g} = 1.2 - 0.4 = 0.8$ $T = \frac{16}{0.8} = 20 sec$

Number of steps $= \frac{1.2 \times 20}{0.3} = 80$

Stream:JEESubject:PhysicsTopic:KinematicsSubtopic:Relative

⏱ 2mℹ️ Source: QB

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