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A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g = 10 m/s2, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest.
  • a)
    4 J
  • b)
    2 J
  • c)
    8 J
  • d)
    10 J
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
A light inextensible string that goes over a smooth fixed pulley as sh...
Given m = 0.36 kg, M = 0.72 kg.
The figure shows the forces on m and M.
When the system is released, let the acceleration be a. Then

T – mg = ma
Mg – T = Ma
∴ 
and T =  4 mg/3
For block m :
u = 0, a = g/3, t = 1, s = ?

∴ Work done by the string on m is
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Community Answer
A light inextensible string that goes over a smooth fixed pulley as sh...
Given m = 0.36 kg, M = 0.72 kg.
The figure shows the forces on m and M.
When the system is released, let the acceleration be a. Then

T – mg = ma
Mg – T = Ma
∴ 
and T =  4 mg/3
For block m :
u = 0, a = g/3, t = 1, s = ?

∴ Work done by the string on m is
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A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g = 10 m/s2, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest.a)4 Jb)2 Jc)8 Jd)10 JCorrect answer is option 'C'. Can you explain this answer?
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A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g = 10 m/s2, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest.a)4 Jb)2 Jc)8 Jd)10 JCorrect answer is option 'C'. Can you explain this answer? for JEE 2025 is part of JEE preparation. The Question and answers have been prepared according to the JEE exam syllabus. Information about A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g = 10 m/s2, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest.a)4 Jb)2 Jc)8 Jd)10 JCorrect answer is option 'C'. Can you explain this answer? covers all topics & solutions for JEE 2025 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for A light inextensible string that goes over a smooth fixed pulley as shown in the figure connects two blocks of masses 0.36 kg and 0.72 kg. Taking g = 10 m/s2, find the work done (in joules) by the string on the block of mass 0.36 kg during the first second after the system is released from rest.a)4 Jb)2 Jc)8 Jd)10 JCorrect answer is option 'C'. Can you explain this answer?.
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