A train starts from rest from a station with acceleration $0.2 \,m / s ^2$ on a straight track and then comes to rest after attaining maximum speed on another station due to retardation $0.4 \,m / s ^2$. If total time spent is half an hour, then distance between two stations is [Neglect length of train]
$216$
$512$
$728$
$1296$
The same retarding force is applied to stop a train. The train stops after $80\, m$. If the speed is doubled, then the stopping distance will be
A particle moving with a uniform acceleration travels $24 \,m$ and $64\, m$ in the first two consecutive intervals of $4 \,sec$ each. Its initial velocity is............$m/sec$
Which graph represents the uniform acceleration
A point starts moving in a straight line with a certain acceleration. At a time $t$after beginning of motion the acceleration suddenly becomes retardation of the same value. The time in which the point returns to the initial point is