What is retardation ?

A car moving along a straight highway with speed of 126 km h^(-1) is brought to a stop within a distance of 200 m. What is the retardation of the car (assumed uniform), and how long does it take for the car to stop ?

A car moving aling a straight highway with speed of 126 km h^(-1) is brought to a stop within a distance of 200 m . What is the retardation of the car (assumed uniform ) ans how doest it take fro the car to stop ?

If a train travelling at 72 km/h is to be brought to rest in a distance of 200m, then its retardation should be:-

When any object is said to have retardation ?

Velocity-time graphs vehicle A for vehicles A and B are shown in figure Which vehicle has accelerated motion vehicle B and which vehicle has retarded motion ?

A bus is moving with the initial velocity of 'u' m/s. After applying the breaks, its retardation is 0.5 m/ s^(2) and it stoped after 12s. Find the initial velocity (u) and distance travel by the bus after applying the breaks.

A parachutist drops first freely from a plane for 10 s and then his parachute opens out. Now he descends with a net retardation of 2.5 ms^(-2) If he bail out of the plane at a height of 2495 m and g=10 ms^(-2) , his velocity on reaching the ground will be .

A train accelerates from rest at a constant rate α a for distance x_(1) and time t _(1) . After that is retards at constant rate beta for distance x_(2) and time t_(2) and comes to the rest. Which of the following relation is correct:-

The unit of retardation is ms^(-2).