Question

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...​

Answer 1

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