A 6 kg and 3 kg blocks are connected by a light string that passes over a very light frictionless pulley. The pulley is suspended by a light spring balance. Then reading of the spring balance is
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a
40 N
b
60 N
c
80 N
d
70 N
answer is C.
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Detailed Solution
Tension in the string connecting the blocks is T=2×3×6×10(3+6)N=40N∴ Reading of spring balance=2×40N=80N