NEET Sample Paper NEET Sample Test Paper-8

  • question_answer A particle is projected from a point A with a velocity V at an angle \[\theta \] (upward) with the horizontal. At a certain point B, it moves at right angle to its initial direction. It follows that:

    A)  velocity of the particle at B is V

    B)  velocity of the particle at B is V \[\cos \theta \]

    C)  velocity of the particle at B is \[V\tan \theta \]

    D)  the time of flight from A to B is \[\frac{V}{g\sin \theta }\]

    Correct Answer: D

    Solution :

                As,           \[\upsilon =u+at\] Considering the motion along the line AC             \[0=\upsilon -g\,\sin \theta \,t\]                 \[t=\frac{\upsilon }{g\sin \theta }\] Now consider the motion along the line C.             \[v'=0+g\cos \theta =\frac{V}{g\sin \theta }=\upsilon \cot \theta \]

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