A block of mass m is kept on a platform. Platform starts moving upwards with an acceleration of g 2 . Find the work done by the normal force on the block in the first one second.

N - m g = m g 2 N = 3 m g 2 s = u t + 1 2 a t 2 = 0 + 1 2 g 2 1 2 = g 4 W N = 3 m g 2 × g 4 = 3 m g 2 8 = 3 m g 2 8

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Physics - W.E.P. Question with Solution | TestHub

PhysicsW.E.P.MiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A block of mass $m$ is kept on a platform. Platform starts moving upwards with an acceleration of $\frac{g}{2}$ . Find the work done by the normal force on the block in the first one second.

Options:

Answer:

Solution:

$N - m g = \frac{m g}{2}$

$N = \frac{3 m g}{2}$

$s = u t + \frac{1}{2} a t^{2}$

$= 0 + \frac{1}{2} \frac{g}{2} {(1)}^{2}$

$= \frac{g}{4}$

$W_{N} = \frac{3 m g}{2} \times \frac{g}{4}$

$= \frac{3 m g^{2}}{8} = \frac{3 m g^{2}}{8}$

Stream:NTA_ABHYAS_NEETSubject:PhysicsTopic:W.E.P.Subtopic:Miscellaneous

⏱ 2mℹ️ Source: PYQ_2020

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