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Question

Assertion (A): When a person steps out of a boat, the boat moves backwards.

Reason (R): The reaction force acting on the boat is in the opposite direction to the direction of movement of the person.


A

A and R are true and R is the correct explanation of A

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B

A and R are true, but R is not the correct explanation of A.

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C

A is true but R is false

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D

Both A and R are false.

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Solution

The correct option is A

A and R are true and R is the correct explanation of A


Step 1: Explanation for Assertion statement

  1. According to Newton's third law, every action has an equal and opposite reaction.
  2. These action and reaction force acts on two different bodies.
  3. For example, when we throw a ball on the wall, the ball applies an action force on the wall, and the wall applies the reaction force on the ball.
  4. Similarly as per Newton's third law, when a person steps out of a boat, the boat moves backward.

Step 2: Explanation for reason statement

  1. As per the laws of motion, every action has an equal and opposite reaction.
  2. When a person steps out of a boat, he or she applies a force on the boat, and similarly, the boat applies a reaction force on the person in the opposite direction.
  3. So the boat moves backward and the person moves forward.

Hence, the correct answer is (A).


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