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

  • question_answer
    A ball of mass 0.2 kg moves with a velocity of 20 m/s and it stops in 0.1 s, then the force on the ball is

    A)  40 N  

    B)  20 N

    C)  4N

    D)  2 N

    Correct Answer: A

    Solution :

                \[F=ma=m\left( \frac{v-u}{t} \right)=\frac{-mu}{t}\] Substituting the values and neglecting the negative sign (because none of the options is negative)             \[F=\frac{0.2\times 20}{0.1}=40\]


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