Questions  

The acceleration of the 2kg block, if the free end of string is pulled with a force of 20N as

            shown below

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a
Zero
b
10 m/s2 upward
c
5 m/s2 upward
d
5 m/s2  downward

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detailed solution

Correct option is B

T=20N 2T2g=2aa=2010=10ms2

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