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9th Class Science Force and laws of motion Question Bank Force and Laws of Motion

  • question_answer
    A cricket ball of mass 150 gram moving with a velocity of 12 m/s strikes against the bat. It renounces with a velocity of 20 m/s. The ball remains in touch with the bat for 0.01 second. The average force applied by the bat on the ball is

    A)  840 Newton

    B)  480 Newton  

    C)  804 Newton

    D)  408 Newton

    Correct Answer: B

    Solution :

     When the direction of motion is reversed, change in momentum\[=m(v+u)\] \[\therefore \]      Force\[=\frac{m(v+u)}{t}\]                     \[=\frac{15\times {{10}^{-2}}\times 32}{{{10}^{-2}}}=480\]


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