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NEET Sample Paper NEET Sample Test Paper-22

  • question_answer
    A 3 kg ball strikes a heavy rigid wall with a speed of 10 m/s at an angle of \[60{}^\circ \]. It gets reflected with the same speed and angle as shown in figure. If the ball is in contact with the wall for 0.2 sec, what is the average force exerted on the ball by the wall?

    A)  0                                

    B)  150 N

    C)       \[150\sqrt{3}\,N\]      

    D)       300 N

    Correct Answer: C

    Solution :

    We know that \[F=\Delta p/\Delta t.[\Delta p=\]\[\text{change}\,\text{in}\,\text{momentum}]\] \[\Delta p=2\,mv\,\sin \theta \] \[=2\times 3\times 10\sin {{60}^{o}}=30\sqrt{3}\]\[F=\frac{\Delta p}{\Delta t}=\frac{30\sqrt{3}}{0.2}=150\sqrt{3}\,N\] Hence, the correction option is [c].


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