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Can anyone answer question 7,8 and 9

Dear Student,
7.option C and D is correct
8.option C and D is correct
9.option D is correct.
Hope this information will clear your doubts about topic.

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Answers are D,C, for 7 and 8 respectively while in question 9 if you have only these two option then answer is option A.
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Friend, in.question 9 D is right answer. since, friction is a vector quantity because it always comes into play in opposite direction of motion of a body .
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