Question

One or more than one choice correct type Questions
Consider the condition shown in the figure. Pulley is massless and frictionless, springs are massless.
Both the blocks are released with the springs in their natural lengths. Choose the correct options.
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lllllll
m
(A) Maximum elongation in the spring s, is
4m,n29
K(m, + m2)
(B) Maximum elongation in the spring s, is
4mm29
K2(m, + m2)
(C) If m, = m, both the blocks will come to instantaneous rest simultaneously.
(D) If K, = K, both the blocks will come to instantaneous rest simultaneously.​

Answer 1

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11th

Physics

Oscillations

Oscillations Due to Spring

System shown in the figure ...

PHYSICS

System shown in the figure is released from rest. Pulley and spring is massless and friction is absent everywhere. The speed of 5 kg block when 2kg block leaves the contact with ground is (take force constant of string = K=40 N/m and g=10 m/s2):



A

2

B

22

Correct Answer

C

42

D

2

MEDIUM

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ANSWER

Given,

Masses,  m=2kgandM=5kg

 

Let x be the extension in spring when m=2kg mass leaves contact with the ground.

kx=mg=2g

x=k2g=402×10=21m

By law of conservation of energy for M=5kg mass

Mgx=21kx2+21