New RBI Grade B 2025 Notification will come Soon! Enroll Here

    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).

    Practice Next