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Question

Two boys wearing in-line skates are standing on a surface with the palms of their hands touching and their arms bent, as shown in the figure. If Boy X pushes by straightening his arms out while Boy Y holds his arms in the original position, what is the motion of the two boys?



A
Boy X does not move and Boy Y moves backward.
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B
Boy Y does not move and Boy X moves backward.
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C
Boy X and Boy Y both move backward
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D
Both boys fall down
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Solution

The correct option is B Boy X and Boy Y both move backward
When Boy X pushes Y, Y moves backward because the push on Y by X is the only force acting on him. Similarly, since every action has an equal and opposite reaction, the force exerted by boy X on Y has the same effect on X, thus pushing X backward as well. Presence of friction help the boys move backward.

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