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  4. As shown in the figure, a particle of mass 10 kg is placed at a point A When the particle is slightly displaced to its right, it starts moving and reaches the point B The speed of the particle at B is x m/s (Take g =10 m / s 2 ) The value of 'x' to the nearest integer is . <img class=img-fluid question-image alt=image src=https://cdn.tardigrade.in/img/question/physics/cabe798ff10cd69649ca8f7e2b9cc67f-.png />

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Q. As shown in the figure, a particle of mass 10 kg is placed at a point A When the particle is slightly displaced to its right, it starts moving and reaches the point B The speed of the particle at B is x m/s (Take $g =10\,m / s ^{2} )$ The value of 'x' to the nearest integer is _______.
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JEE MainJEE Main 2021Work, Energy and Power

Solution:

Using work energy theorem,
$W _{ g }=\Delta K . E$
$(10)( g )(5)=\frac{1}{2}(10) v ^{2}-0$
$v =10\,m / s$