brakes are applied to a train travelling at 72 kilometre per hour after going to hundred metre its velocity reduces to 36 kilometre per hour at the same rate of retardation how much further will it go before coming to rest...
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Answer:
20 metres
Explanation:
Initial velocity = 72 km/hr = 20 m/sec
Final velocity = 0 m/sec (because train is coming to a rest)
Acceleration = -36 km/hr = -10 m/sec
Applying the third equation of motion,
v²-u² = 2as
0-20² = 2 (-10) (s)
-400 = -20s
s = 20 metres
Hence the train will cover 20 metres before coming to a rest.
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