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Question

Pick the cases where Newton's third law of motion is the main principle behind the event.

A
Swimming in a pool
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B
Dusting a carpet
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C
A space shuttle being launched
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D
Recoil of a gun while firing
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Solution

The correct option is D Recoil of a gun while firing
A space shuttle releases exhaust gases to move upward. Similarly, a gun moves in the direction opposite to the direction of firing of bullet due to reaction force acting on it. Swimming is also an example of Newton's third law of motion, where the swimmer pushes the water backward inorder for him/her to move forward.
However, when a carpet is beaten with a stick, the dust particles in it would remain in state of rest due to inertia. Hence, the separation of the dust particles and the carpet is primarily explained using Newton's first law.

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