7th Class Science Time and Motion Question Bank Motion and Time

  • question_answer
    DIRECTIONS: On the basis of following diagram/picture answer the questions given below: Trolley X and trolley Y are joined by a stretched spring. Trolley X has twice the mass of trolley Y. When the trolleys are released, the acceleration Of X is \[\text{2 m}/{{\text{s}}^{\text{2}}}\] to the right. What is the initial acceleration of trolley Y to the left?

    A)  \[\text{1m}/{{\text{s}}^{\text{2}}}\]                     

    B)  \[\text{2 m}/{{\text{s}}^{\text{2}}}\]

    C)  \[\text{3 m}/{{\text{s}}^{\text{2}}}\]                    

    D)  \[\text{4 m}/{{\text{s}}^{\text{2}}}\]

    Correct Answer: D

    Solution :

        Trolley X has twice the mass, hence half the acceleration compared to Y. This is also a demonstration of Newton?s third law about and equal and opposite reaction force.


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