Flag Mechanics> A train stops at two station P & Q which ...
question mark

A train stops at two station P & Q which are 2 km apart .It acceleratesuniformly from P at 1m/s*2 for 15sec & maintains a constant speed for a time before decelerating uniformly to rest at Q the decelration is 0.5ms*2, find time forwhich train is travelling at constant speed

NARENDRA YADAV , 7 Years ago
Grade 11
anser 1 Answers
Kruthic

Last Activity: 7 Years ago

When the train starts at P
Displacement in 15 seconds=ut+0.5at=0.5*1*15*15=225/2 metres.
Velocity attained=u+at=1*15=15m/s.
Let the train travel with 15m/s for t seconds.
Displacement covered by the train while travelling with constant velocity=vt=15t
While the train decelarates, v2-u2=2as
s=(v2-u2)/2a=-15*15/2(-0.5)=225metres
Total displacement=225/2+15t+225
2000=225/2+225+15t
15t=1662.5
Therefore , t=1662.5/15=110.83seconds.
 

Provide a better Answer & Earn Cool Goodies

Enter text here...
star
LIVE ONLINE CLASSES

Prepraring for the competition made easy just by live online class.

tv

Full Live Access

material

Study Material

removal

Live Doubts Solving

assignment

Daily Class Assignments


Ask a Doubt

Get your questions answered by the expert for free

Enter text here...