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      Question

      A car moving at 72 km/h is brought to rest in 10

      seconds. What is its acceleration?  
      A –2 m/s² Correct Answer Incorrect Answer
      B –1.5 m/s² Correct Answer Incorrect Answer
      C –3 m/s² Correct Answer Incorrect Answer
      D –4 m/s² Correct Answer Incorrect Answer

      Solution

      First convert 72 km/h to m/s 72×1000/3600=20m/s Initial velocity u = 20m/s Final velocity v = 0 Time = 10 sec A= (v-u)/t = (0-20)/10 = 2m/s2 Negative sign shows retardation (deceleration).

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