Question

The greatest acceleration or deceleration that a train may have is α .The minimum time in which the train can get from one station to the next at a distance S is

Answer 1

d = ut + 0.5dt^2

Firstly:

Differentiate t w.r.t d then,

1 = udt/dd +d*t*dt/dd

dt/dd(u+t*d) = 1

dt/dd = 1/(u + t*d)

1/(u+td) = 0

Here t is an infinity