A train starting from rest travels the first part of its journey with constant acceleration a, secondpart with constant velocity v nd third part with constant retardation a, being brought to rest.the average speed for the whole journey is7v8. The train travels with constant velocity for...of the total time -

A body travels a distance s in t seconds. It starts from rest and ends at rest . In the first part of the journey , it moves with constant acceleration f and in the second part with constant retardation r. the value of t is given by

A train starts from rest and for the first kilometer moveswith constant acceleration. For the next 3 kilometers it has constant velocity and for another two kilometers it moves with constant retardation to come to rest after a total time of 10 minutes. The maximum velocity of the train is

A lift ascends with constant acceleration a=1ms^(-2) , then with constant velocity and finally, it stops under constant retardation a=1ms^(-2) . If total distance ascended by the lift is 7 m, in a total time of the journey is 8 s. Find the time (in second) for which lift moves with constant velocity.

A lift ascends with constant acceleration a=1ms^(-2) , then with constant velocity and finally, it stops under constant retardation a=1ms^(-2) . If total distance ascended by the lift is 7 m, in a total time of the journey is 8 s. Find the time (in second) for which lift moves with constant velocity.

Starting from rest a particle is first accelerated for time t_1 with constant acceleration a_1 and then stops in time t_2 with constant retardation a_2. Let v_1 be the average velocity in this case and s_1 the total displacement. In the second case it is accelerating for the same time t_1 with constant acceleration 2a_1 and come to rest with constant retardation a_2 in time t_3. If v_2 is the average velocity in this case and s_2 the total displacement, then