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Questions  

A dynamometer D is attached to two bodies of masses M = 6kg and m = 4 kg. Forces F = 20N and f = 10N are applied to the masses as shown. The dynamometer reads

a
10 N
b
20 N
c
6 N
d
14 N

detailed solution

Correct option is D

Acceleration of system,                                     a=F-fM+m=20-106+4=1 ms-2 (towards left) Let F0 be the reading of dynamometer, then equation of motion of mass m would be              F0 - f = ma⇒  F0=f+ma=10+(4)(1)=14 N

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