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JEE Main & Advanced Sample Paper JEE Main Sample Paper-13

  • question_answer
    A freely falling body, falling from a tower of height h covers a distance h/2 in the last second of its motion. The height of tower is nearly

    A)  58 m                                    

    B)  50 m            

    C)  60 m                                    

    D)  65 m

    Correct Answer: D

    Solution :

     Let the total time of journey is n seconds, then by using \[z=1\] we get\ \[{{r}_{1}}={{r}_{0}}\]     \[\therefore \] ?(i) and by using \[{{r}_{2}}=4{{r}_{0}}\] we get \[{{r}_{3}}=9{{r}_{0}}\]                  ?(ii) On solving Eqs. (i) and (ii), we get \[{{r}_{1}}:{{r}_{2}}:{{r}_{3}}=1:4:9\] \[{{V}_{1}}={{V}_{2}}\]                  \[{{V}_{2}}>{{V}_{4}}\]


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