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NEET Sample Paper NEET Sample Test Paper-8

  • question_answer
    A 3kg ball strikes a heavy rigid wall with a speed of \[10m/s\] at an angle of \[{{60}^{o}}\] with the wall. It gets reflected with the same speed at \[{{60}^{o}}\] with ball. If the ball is in contact with the wall or \[0.2s,\] the average force exerted on the ball by the wall is:

    A)  300N            

    B)  zero

    C)  \[150\sqrt{3N}\]         

    D)  150 N

    Correct Answer: C

    Solution :

    As, velocity towards the wall is \[V\,\,sin\,\theta i\]and the velocity outward to the wall is \[V\,\,sin\,\theta \,(-i)\] Now    \[|\Delta P|\,=V\,\sin \theta -(-\sin \theta )\]                         \[=2V\,\sin \theta \]                                 \[F=\frac{2m\upsilon \sin \theta }{t}\]      \[\left( as,\,\,F=\frac{\Delta p}{\Delta t} \right)\]                                 \[=\frac{2\times 3\times 10\sin {{60}^{o}}}{0.2}=150\sqrt{3}N\]


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