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JEE Main & Advanced Physics Motion in a Straight Line / सरल रेखा में गति Question Bank Uniform Motion

  • question_answer
    A boy walks to his school at a distance of 6 km with constant speed of 2.5 km/hour and walks back with a constant speed of 4 km/hr. His average speed for round trip expressed in km/hour, is                          [AIIMS 1995]

    A)         24/13      

    B)        40/13

    C)         3 

    D)       ½

    Correct Answer: B

    Solution :

               Distance average speed \[=\frac{2{{v}_{1}}{{v}_{2}}}{{{v}_{1}}+{{v}_{2}}}\]\[=\frac{2\times 2.5\times 4}{2.5+4}\]             \[=\frac{200}{65}=\frac{40}{13}km/hr\]


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