A car moving along a straight highway with speed of 126 km/hr is brought to stop with in a distance of 200m. What is the retardation of the car

given initial velocity of car =u=126 km/hr⇒126×518m/s2⇒35 m/s2 The car finally comes to rest so V=0   From kinematics equation v2−u2=2asacceleration=a=v2−u22sa=02−3522×200a=−3.06m/s2