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A train is travelling at a …

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A train is travelling at a speed of 90 km/h . Brakes are applied so as to produce a uniform acceleration of _ 0.5 m/s2 . Find how far the train will go before it is brought to rest.

Posted by Muskan Singh 3 years, 9 months ago

CBSE > Class 09 > Science

1 answers

K. K. 3 years, 9 months ago

Hi there, Initial velocity is 90km/ hr That is u=90 km/ hr Converting to m/s we get u=25m/s Acceleration will be negative because of application of brakes , so the train retards. Therefore a= -0.5m/s^2 Since the train has stopped , therefore final velocity ( v) = 0m/s Now let distance be 's' Using the above information we use the third equation of motion, That is 2as= v^2-u^2 Putting the values we know 2*-0.5*s= 0^2-(25)^2 -s=-625 s=625m Thus, the train covers a distance of 625m

3Thank You

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