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JEE Main & Advanced Physics Vectors Question Bank Addition and Subtraction of Vectors

  • question_answer
    A plane is revolving around the earth with a speed of 100 km/hr at a constant height from the surface of earth. The change in the velocity as it travels half circle is                 [RPET 1998; KCET 2000]

    A)                 200 km/hr

    B)                             150 km/hr

    C)                 \[100\,\sqrt{2}\,km/hr\]

    D)                             0

    Correct Answer: A

    Solution :

                        \[\Delta v=2v\sin \left( \frac{\theta }{2} \right)=2\times v\times \sin 90{}^\circ \]                 \[=2\times 100=200\ km/hr\]


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