15. The given figure shows a heavy block of mass M kept on a
frictionless surface and being pulled by two ropes of
equal mass m. Att = 5 s, the force on the left rope
is withdrawn but the force on the right end continues
to act. Find the magnitude of the force by the right
rope on the block.
A. MF/m+2m
B. (M+m) F/M+2m
c none of these
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Option B
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