6th Class Science Motion Question Bank Motion And Measurement

  • question_answer A car starting from rest acquires a velocity of 54 \[km{{h}^{-1}}\]in 20 seconds. What is its acceleration?

    A) \[2.7m/{{s}^{2}}\]  

    B)  \[1.08m/{{s}^{2}}\]

    C) \[1m/{{s}^{2}}\]     

    D)  \[0.75m/{{s}^{2}}\]

    Correct Answer: D

    Solution :

        Acceleration \[\text{=}\frac{\text{change}\,\text{in}\,\text{velocity}}{\text{time}}\] \[=\frac{54km/h-0}{20}=\frac{54m/s-0}{20}=0.75m/{{s}^{2}}\] \[\left( \because 54\,km/h\frac{54\times 1000m}{3600\sec }=15m/s \right)\]

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