The question is assertion and reason type.!
Please explain me que 7 in the attachement.
Ans. given is option 1
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Answers
Answer:
The answer to this question should be 4th means both assumption and reason are wrong but since the book has marked the answer 1 means both are correct so I'll explain both the answers.
Explanation:
According to the law of conservation of centre of mass which is modified to the law of conservation of momentum, the direction or the dimension in which force is zero the momentum should be conserved. Now according to the reason the force in the perpendicular direction or y-axis is zero ( depends on the system-- means if you are talking about space or some other planet other than earth, that is a theoretical system, only if the book doesn't specify EARTH), so the momentum in y-axis must be conserved.
Now according to my point of view----The assertion says the word "only in the y-axis" is wrong, the momentum should be conserved in both x and y-axis since it's not been told that either of them or both had an acceleration. Which makes the assumption wrong. Now, as far as the reason is concerned it says the word " force in the y axis is zero" which is not entirely true because, in the real world, the objects must be moving on something, which means they have a downward force 'mg' in the y-axis and they are experiencing normal force, which makes the reason wrong. So according to my point of view, the answer should be 4th--both assumption and reason are wrong.