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Q.

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

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a

Zero

b

$10 m / s^{2}$

c

$5 m / s^{2} upward$

d

$5 m / s^{2} downward$

answer is B.

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Detailed Solution

Upward force on 2 kg block in upward direction will be 40 N (=2F) in the form of tension.

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$∴ a = \frac{40 - 20}{2} = 10 m / s^{2}$

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