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Q.

Consider the system as shown in the figure. The pulley and the string are light and all the surfaces are frictionless. The tension in the string is  g=10m/s2
 

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a

1 N

b

5 N

c

0 N

d

2 N

answer is D.

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Detailed Solution

The acceleration of block of mass m1 is
 

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a=m1m1+m2g=5m/s2

From FBD of block m1
 

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⇒T=m1(g−a)=1×5=5N

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Consider the system as shown in the figure. The pulley and the string are light and all the surfaces are frictionless. The tension in the string is  g=10m/s2