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

  • question_answer
    A truck and a car are moving with equal velocity. On applying brakes, if both decelerate at the same rate, what happens?

    A)  The truck will cover less distance before stopping.

    B)  The car will cover less distance before stopping.  

    C)  Both will cover equal distance.

    D)  None of the above

    Correct Answer: B

    Solution :

     A truck and a car are moving with equal velocity, \[a=\frac{{{v}^{2}}-{{u}^{2}}}{2s}\]and\[m\propto \frac{1}{a}\], therefore \[m\,\,\alpha \,\,s\].This implies that car will cover less distance before stopping because the mass of the car is less.


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