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Q.

Three blocks a, b, and c of masses 10 kg, 10 kg and 20 kg are arranged as shown in figure. All the surfaces are frictionless and string is inextensible. Pulleys are light. A constant force F = 20 N is applied on block a as shown. Pulleys and string are light. Part of the string connecting both pulleys is vertical and part of the strings connecting pulleys with blocks a and b are horizontal.

 

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a

Acceleration of mass block b is 1.

b

Acceleration of mass blocks a, b and c is 0.5 m/s2.

c

Tension in the string is 10 N.

d

Acceleration of mass block c is 0.5

answer is B, C.

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Detailed Solution

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F−T=10×a …(1) T=10×a    …(2)F=20a    ⇒ a=1T=10N,    aa=ab=1, ac=0

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Three blocks a, b, and c of masses 10 kg, 10 kg and 20 kg are arranged as shown in figure. All the surfaces are frictionless and string is inextensible. Pulleys are light. A constant force F = 20 N is applied on block a as shown. Pulleys and string are light. Part of the string connecting both pulleys is vertical and part of the strings connecting pulleys with blocks a and b are horizontal.