Question

# A dynamometer $$D$$, is connected with two bodies of mass $$M = 6 kg$$ and $$m = 4kg$$. If two forces $$F = 20 N$$ & $$F = 10 N$$ are applied on masses according to figure then reading of the dynamometer will be:

A
10N
B
20N
C
6N
D
14N

Solution

## The correct option is C $$14 N$$acceleration of the system$$a=\dfrac {20-10}{6+4}=1 m/s^2$$If tension in the spring is $$T$$ then for $$6 kg$$ block$$20 - T = 6 \times 1 \Rightarrow T = 14 N$$so reading will be $$14 N$$Physics

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