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NEET Sample Paper NEET Sample Test Paper-56

  • question_answer
    A ball is thrown vertically upwards with a velocity of 25m/s from the top of a tower of height 30m. How long will it travel before it hits ground:

    A) 1 sec                            

    B) 6 sec    

    C) 2 sec                

    D) 5 sec

    Correct Answer: B

    Solution :

    [b] \[S=ut+\frac{1}{2}g{{t}^{2}}\] \[30=-\,25t+5{{t}^{2}}\] \[6=-\,5t+{{t}^{2}}\] \[{{t}^{2}}-5t-6=0\] \[(t-6)(t+1)=0\]             \[t=6\,\sec \]


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