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QJEEM21Ph1885: JEE Main 2021 Physics - Class 11 JEEM21Ph1885 Solution: As shown in the figure, a particle of mass 10 kg is placed at a …

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/s2)

The value of 'x' to the nearest integer is __________.

JEE Main 2021 (Online) 18th March Morning Shift Physics - Work Power & Energy Question 83 English

Step-by-Step Verified Solution

By energy conservation

Ki + Ui = Kf + Uf

0 + 10 ×\times 10 ×\times 10 = 12{1 \over 2} ×\times 10 ×\times v B2_B^2 + 10 ×\times 10 ×\times 5

1000 = 5v B2_B^2 + 500

v B2_B^2 = 5005{{500} \over 5} = 100

VB = 10 m/s

x = 10

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