JEE Main & Advanced Sample Paper JEE Main Sample Paper-4

  • question_answer
    A wooden block is dropped from the top of a cliff 100 m high. Simultaneously a bullet is fired from the foot of the cliff upward with a velocity of 100 m/s. The bullet hits the wooden block after - \[[Takeg=10\text{ }m/{{s}^{2}}]\]

    A)  10 s                      

    B)  0.5 s

    C)  1 s                         

    D)  7s

    Correct Answer: C

    Solution :

    Here acceleration of bullet with respect to block is zero. Let t is the required time then \[\text{t=}\frac{\text{relative}\,\text{seperation}}{\text{initial}\,\text{relative}\,\text{speed}}\text{=}\frac{\text{100}}{\text{100}}\text{=1s}\] Note: Answer is reasonable as time of flight of bullet & block both are greater then is.

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