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Question

A box is at rest on a smooth surface. Two friends are pushing it in opposite directions as shown. Choose the correct options.

A
The net force is zero.
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B
The net force is 3 N in the right direction.
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C
The net force is 3 N in the left direction.
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D
The net force is 17 N in the left direction.
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Solution

The correct option is C The net force is 3 N in the left direction.
Forces in the opposite directions are subtracted. So, the net force will be in the direction of the greater force.
Therefore,
Net force (F) = 10 - 7 = 3 N (towards left)

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