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      Question

      A car increases its speed from 10 m/s to 30 m/s in 5

      seconds. What is its acceleration?  
      A 4 m/s² Correct Answer Incorrect Answer
      B 5 m/s² Correct Answer Incorrect Answer
      C 6 m/s² Correct Answer Incorrect Answer
      D 3 m/s² Correct Answer Incorrect Answer

      Solution

      Acceleration a = (v - u)/t = (30 - 10)/5 = 20/5 = 4 m/s²   This is uniform acceleration, meaning speed increases evenly.  

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