Physics, asked by Abhishekaryan, 1 year ago

between two stations a train accelerates uniformly at first then moves with constant velocity and finally retards uniformly if the ratio of the time taken by 1 ratio 8 ratio 1 and the max speed attained be 60 kmph then what is the average speed over the whole journey

Answers

Answered by 9234201771
235
Let it accelerates with say ‘a’ in time ‘x’ then it reaches a velocity ‘v’ and continues motion for time ‘8x’ abd finally then retards with ‘b’ in time ‘x’.

v = 0 + ax

=> v = ax

=> 60 = ax

=> a = 60/x

And,

0 = v – bx

=> b = 60/x

Distance covered in time of acceleration,

S1 = 0 + ½ at2

=> S1 = ½ ax2 = ½ × 60/x × x2 = 30x

Distance covered while moving with constant velocity is,

S2 = vt = 60 × 8x = 480x

Distance covered in time of retardation,

02 = v2 - 2bS3

=> S3 = 602/(2 × 60/x)

=> S3 = 30x

So, total distance = 30x + 480x + 30x = 540x

Total time = x + 8x + x = 10x

So, average velocity = 540x/10x = 54 km/h

Answered by darshilshah7
55

Answer:

54 Km/h if we want is SI Unit The Answer will be 15 m/s

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