A train travels from station A to B with a speed of 60 km/h and returns to A with a speed of 80 km/h. What is the average velocity and Average speed of the train
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A train travels from station A to B with a speed of 36 km/h and returns to A with a speed of 54km/h. Wgat is the average velocity and Average speed of the train
Ask for details Follow Report by Mithunjohn2839 11.05.2018
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kartiksaini200p8mkgl
kartiksaini200p8mkgl Ambitious
Average velocity will be zero as displacement is zero
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priyansupatri
thanks
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lidaralbany Virtuoso
Answer:
The average speed of the train is 43.2 km/h.
Explanation:
Given that,
Speed A to B = 36 km/h
Speed B to A = 54 km/h
Let us consider the distance from A to B is x. The train moves from station A to station B and return from station B to station A.
Therefore, The displacement is zero.
So, The average velocity will be zero.
The distance is the product of the speed and time.
The average speed will be
The time taken from A to B
Time t_{1}= \dfrac{x}{36\ km/h}.....(I)
The time taken from B to A
Time t_{2}= \dfrac{x}{54\ km/h}.....(II)
Average\ speed = \dfrac{Total\ distance}{total\ time}
v_{avg}=\dfrac{2x}{\dfrac{x}{36}+\dfrac{x}{54}}
v_{avg}=43.2\ km/h
Hence, The average speed of the train is 43.2 km/h.
Step-by-step explanation:
average speed = u+v/2
=80+60/2
=70 km/hr
average velocity=2v1*v2/v1 +v2
=2×80×60÷80+60
=68.57 km/hr
=19.04 m/s