a train can accelerate at 20 cm/s and decelerate at 100 cm/s Then the minimum time for train to travel between 2 stations 2km apart is...
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Explanation:
Max. Speed , v=u+at=0.2t,
v=0.2t
1
------------(1)
Dec --- v=u–at
0=v–1.0t
2
,v=t
2
----(2)
t
1
=
0.2
t
2
=5t
2
S=ut+
2
1
at
2
S=2700m
2700=0.1[(5t
2
)
2
+(t
2
)
2
−
2
1
t
2
2
]
r=80cm
3t
2
2
=2700
t
2
=30sec,t
1
=150sec
Total time = t
1
+t
2
=150+30=180sec
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