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Q.

Figure shows four blocks that are being pulled along a smooth horizontal surface. The masses of the blocks and tension in one cord are given. The pulling force $F$ is :

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a

$200 N$

b

$125 N$

c

$50 N$

d

$100 N$

answer is D.

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Detailed Solution

$a_{x} = \frac{F \cos 60 °}{M} = \frac{F}{2 \times 10} = \frac{F}{20}$

Thus $30 = (2 + 1) \times \frac{F}{20}$

$∴ F = 200 N$

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