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A student calculates the acceleration of...

A student calculates the acceleration of `m_(1)` in figure shown as `a_(1) = ((m_(1) -m_(2))g)/(m_(1) +m_(2))`. Which assumption is not required to do this calculation.

A

pulley is frictionless

B

string is massless

C

pulley is massless

D

string is inextensible

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The correct Answer is:
C
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