Between two stations a train accelerates uniformly at first, then moves with constant speed and finally retards uniformly to come to rest. If the ratios of time taken are 1 : 8 : 1 and the greatest speed is 60 km/hour. Then the average speed over the whole journey
Text Solution
Verified by ExpertsThe correct answer is:
B
V = u + at
60 = O + a × t ⇒ at = 60
S 1 = 
at 2 = 
× 60 × t = 30t
S 2 = V × 8t = 8 at 2 = 8 × 60 × t = 480t
S 3 = Vt – 
at 2 = at 2 – 
at 2 = 
at 2 = 30t
V avg = 
= 
= 54 km/hr
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