Questions
A metro train starts from rest and in 5 s achieves 108 km. After that it moves with constant velocity and comes to rest after travelling 45 m with uniform retardation. If total distance travelled is 390 m, find total time of travelling.
detailed solution
Correct option is D
Velocity time graph is S1=12vt=12108×5185=75m t1=5secS2 =390-75-45=270mt2=27030=9secs3=12×30×t3=45t3=45×230=3secTotal time = 9+5+3=17 secSimilar Questions
A man moves from home to market which is at a distance of 2 km with a speed of 3 kmph. Finding the market closed he instantly returns home with a speed 6 kmph. The average velocity of the man in the total journey is
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