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PhysicsW.E.P.Calculation of workMedium2 minPYQ_2019

PhysicsMediumsingle choice

A block of mass $m$ is kept on a platform which starts from rest with a constant acceleration $g / 2$ upwards, as shown in the figure. Work done by normal reaction on block in time $t$ is

Question diagram: A block of mass m is kept on a platform which starts from re

Options:

Answer:

D

Solution:

$N - m g = \frac{m g}{2}$
$N = \frac{3 m g}{2}$
$s = u t + \frac{1}{2} a t^{2}$
$= 0 + \frac{1}{2} \frac{g}{2} t^{2}$
$= \frac{g}{4}$ $t^{2}$
$W_{N} = \frac{3 m g}{2} \times \frac{g}{4} t^{2}$
$= \frac{3 m g^{2} t^{2}}{8} = \frac{3 m g^{2} t^{2}}{8}$

Stream:JEESubject:PhysicsTopic:W.E.P.Subtopic:Calculation of work

⏱ 2mℹ️ Source: PYQ_2019

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