9th Class Science Time and Motion Question Bank Case Based MCQs - Motion

  • question_answer
    A car accelerates uniformly from 18 km/h to 36 km/h in 5 minutes. The acceleration is

    A) \[5m{{s}^{-2}}\]  

    B) \[1km{{s}^{-2}}\]

    C) \[216m{{s}^{-2}}\]      

    D) \[216km{{h}^{-2}}\]

    Correct Answer: D

    Solution :

    [d] Given, \[{{v}_{1}}\]= 18  km/h, \[{{v}_{2}}\]= 36 km/h  
    and \[t=5=min\frac{5}{60}\operatorname{h}\ =\frac{1}{12}\operatorname{h}\]
    \[\therefore \operatorname{Acceleration},a\frac{{{v}_{2}}-{{v}_{1}}}{t}\]
    \[=\frac{36-18}{1/12}\] = 216 \[{{\operatorname{kmh}}^{-2}}\]
     


You need to login to perform this action.
You will be redirected in 3 sec spinner