9th Class Science Force and laws of motion Question Bank MCQs - Force and Laws of Motion

  • question_answer
    A body at rest explodes into two equal parts. Then, they move with

    A) different speeds in different directions

    B) different speeds in same direction

    C) same speed in same direction

    D) same speed in opposite directions

    Correct Answer: D

    Solution :

    [d] They move with same speed in opposite directions in order to conserve their linear momentum.
    \[\operatorname{i}.e.{{m}_{1}}{{v}_{1}}+{{m}_{2}}{{v}_{2}}\]=0
    \[\therefore \ \ \ \ {{v}_{1}}=-{{v}_{2}}\]           \[[\because \ {{m}_{1}}={{m}_{2}}]\]


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