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NEET Sample Paper NEET Sample Test Paper-78

  • question_answer
    If a car of mass 1000 kg negotiates a banked curve of radius 90 m on a irictioluess load. If the angle of banking is \[45{}^\circ \], then speed of car is                                                                                 

    A)  10 m/s             

    B)  5 m/s                

    C)  20 m/s             

    D)  30 m/s

    Correct Answer: D

    Solution :

    For safe banking, \[\tan \,\theta \,\,=\,\,\frac{{{v}^{2}}}{Rg}\] \[\Rightarrow \,\,\,\,\,\,\,\,\,\,\,\,\,\,v=\sqrt{Rg\,\,\tan \,\theta }\] \[=\,\,\,\sqrt{90\times 10\times tan45{}^\circ }\,\,=\,\,30\,m/s\]


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