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PhysicsW.E.P.MiscellaneousEasy2 minPYQ_2020

PhysicsEasysingle choice

A massless string and a spring connect two blocks A and B to each other. Block B slides over a frictionless inclined plane while block A slides over horizontal surface. Coefficient of friction between block A horizontal surface is $μ = 0.2.$ At the instant shown blocks are moving with constant speed. Mass of block A and energy stored in spring are respectively. $[g = 10 m / s^{2}, m_{B} = 2 kg]$

Options:

Answer:

Solution:

$2 g s i n θ = k x = μ m_{A} g$

$\Rightarrow m_{A} = \frac{2 g sin θ}{μ g} = \frac{2 sin θ}{μ} = \frac{2 \times \frac{1}{2}}{0.2} = 5 kg$

$kx = 2 \times 10 \times \frac{1}{2} = 10$

$x = \frac{10}{1 \times 1 0^{3}} = 1 cm$

$\Rightarrow Energy = \frac{1}{2} \times 1 0^{3} \times {(1 0^{- 2})}^{2} = 0.05 Joule$

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

⏱ 2mℹ️ Source: PYQ_2020

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