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Physics - NLM Question with Solution | TestHub

PhysicsNLMFrictionMedium2 minQB

PhysicsMediumsingle choice

Two blocks A and B, attached to each other by a massless spring, are kept on a rough horizontal surface ( $μ = 0.1$ ) and pulled by a force $F = 200$ N as shown in the figure. If at some instant the 10 kg mass has acceleration of $12$ m/s², what is the acceleration of the 20 kg mass? (Take $g = 10$ m/s²)

Options:

Answer:

Solution:

On A: spring force
$F_{s} - μ m_{A} g = m_{A} a_{A}$
gives
$F_{s} = 10 (12) + 0.1 (10) (10) = 130 N .$
On B
$200 - 130 - 0.1 (20) (10) = 20 a_{B}$
so
$a_{B} = \frac{50}{20} = 2.5 m/ s^{2} .$
Option A.

Subject:PhysicsTopic:NLMSubtopic:Friction

⏱ 2mℹ️ Source: QB

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