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Q.

A dynamometer D is attached to two blocks of masses 6 kg and 4 kg. Forces of 20 N and 10N are applied on the blocks as shown in Fig. The dynamometer reads

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a

10 N

b

20 N

c

6 N

d

14 N

answer is D.

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Detailed Solution

   20−D=6a

−10+D=4a_

            10=10a

a=1 ms−2

D−10=4a

D−10=4

D=14N

The dynometer reads 14 N

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