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NEET Sample Paper NEET Sample Test Paper-3

  • question_answer
    A ball of mass m approaches a wall fo mass m \[(>>m)\]with speed 4 m/s. along the normal to the wall. The speed of wall is 1m/s towards the ball. The speed of the ball after an elastin collision with the wall is:

    A)  5m/s away from the wall

    B)  9m/s away from the wall

    C)  3m/s away from the wall

    D)  6m/s away from the wall

    Correct Answer: D

    Solution :

        Let V be the velocity of ball after collision collision is elastic \[e=1\] Relative velocity of sepration = relative velocity of approach \[\therefore \]   \[V-1=4+1\]or \[V=6m/s\] (away from the wall).


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