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Question

What would be the normal reaction, if the direction of 50 N force is reversed?
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A
2 N
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B
18 N
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C
15 N
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D
0
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Solution

The correct option is C 0
If the direction of the 50N force is reversed, the blocks would separate from each other, since they would move towards right with 8kg block moving with higher acceleration, which means that they won't be in contact anymore. Hence, the normal reaction between them would be zero.

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