A system of two block A and B of masses 20  kg and 10 kg connected by a string which hangs over a...

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A system of two block A and B of masses 20  kg and 10 kg connected by a string which hangs over a friction- less massless pully. What will be the acceleration of centre of mass?
a. 1.08  m / s^2
b. 2  m / s^2
c. 0.3  m / s^2
d. 0.9  m / s^2

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