Physics, asked by destroyers16, 11 months ago

on a 60 km track a train travels the first 30 kilometre with a uniform speed of 30 km per hour how fast must the train travel the next 30 kilometre so as to average 40 kilometre per hour for the entire trip

Answers

Answered by pankaj890

Answer:

speed should be 60km/hr

Attachments:

Allyyy: dear pankaj.how you put v1= 60 in ur solution ?

pankaj890: okay. sorry, answer will be 60km/hr

pankaj890: method will be same.

Allyyy: it's 50

destroyers16: I really don't know

Allyyy: ufffff..

destroyers16: what thing are you expressing me

pankaj890: one minute

pankaj890: nothing, please check my explanation

pankaj890: i as m correct

Answered by Allyyy

Answer:

50km/hr

Explanation:

v1= 30km/h

v2=?

Vavg= (v1+V2)/2

40= (30+V2) /2

40x2 = 30+V2

80= 30+V2

80-30= V2

50Km/h = v2

pankaj890: when time is same then your answer will be correct. but here distance is same so answer will be 30km/hr

Allyyy: dear (30+30)/2 = 30.. but in question AVG v must be 40..so plz reread question

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