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PhysicsNLMFBD & EquilibriumMedium2 minQB

PhysicsMediuminteger

The system shown is in equilibrium. When string A is cut the initial acceleration of upper block will be ____ m/s2.

$[g = 10 m / s^{2}]$ [Hint: spring force does not change instantly]

Answer:

Solution:

In equilibrium the spring carries the lower 2 kg block, so spring force $= 2 g$ , pulling the upper block DOWN

Just after string A is cut, the spring force cannot change instantly

Upper block: gravity $2 g$ down + spring force $2 g$ down

$a = \frac{2 g + 2 g}{2} = 2 g = 20$ m/s $^{2}$

Subject:PhysicsTopic:NLMSubtopic:FBD & Equilibrium

⏱ 2mℹ️ Source: QB

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