What is retardation ?

A body has an acceleration of -4ms^(-2) . What is its retardation?

(Answer the following questions briefly and to the point :) A constant retarding force of 100 N is applied to a body of mass 10 kg moving initially with a speed of 30 ms^(-1) . What is the retardation of the body ?

A car moving with a speed of 126 kmh^-1 is brought to stop within a distance of 200 m. What is its retardation and how long it takes for the car to stop ?

A car moving along a straight highway with a speed of 72 km h^(-1) is brought to a stop within the distance of 100 m . What is the retardation of the car and how long does it take for the car to stop ?

A car moving along a stainght highway with a speed of 72 kmh^(-1) is brought to a stop within a distance of 100m. What is the retardation of the car and how long does it takes for the car to stop ?

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

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 ?