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

  • question_answer
    The law in which the sum of product of masses and velocities of two moving bodies before and after their collision remains constant is known as law of conservation of mass.

    A) True                                         

    B) False

    C) Can't say                                  

    D) Partially true/false

    Correct Answer: B

    Solution :

    [b] False: When two bodies collide with each other, then according to law of conservation of momentum, \[{{m}_{1}}{{u}_{1}}+{{m}_{2}}{{u}_{2}}={{m}_{1}}{{v}_{1}}+{{m}_{2}}{{v}_{2}}\]


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