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 constant retarding force of 50 N is applied to a body of mass 20kg moving initially with a speed of 15ms^(-1) . How long does the body take to stop?

A car is moving along the circumferance of a circle of radius r . a)What is the distance travelled in one revolution? b)What is the displacement in one revolution? c)What does the speedometer of the car measure? d)Can a body have acceleration without velocity.Explain.