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Physics - NLM Question with Solution | TestHub

PhysicsNLMChallenging application of NLMMedium2 minQB

PhysicsMediumsingle choice

A body of mass m starts sliding down a movable inclined plane of mass 2 m at t $= 0$ , assuming friction is absent everywhere the kinetic energy of 2 m as a function of time is (m remains on 2m) best represented by

Options:

Answer:

Solution:

The wedge (mass $2 m$ ) is pushed horizontally by the normal force $N$ from the block, so it has a constant horizontal acceleration $a_{x} = \frac{N sin 3 0 ^{\circ}}{2 m}$ starting from rest.

$v = a_{x} t$ , so $K E = \frac{1}{2} (2 m) a_{x}^{2} t^{2} \propto t^{2}$ . The graph of KE against $t$ is a parabola starting at the origin, option (B).

Stream:JEESubject:PhysicsTopic:NLMSubtopic:Challenging application of NLM

⏱ 2mℹ️ Source: QB

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