Abanked circular highway curve is designed for traffic moving at 64 km/h. the radius of the curve is 207 m. traffic is moving along the highway at 51 km/h on a rainy day. what is the minimum coefficient of friction between tires and road that will allow cars to negotiate the turn without sliding off the road?

A980-kg sports car collides into the rear end of a 2300-kg suv stopped at a red light. the bumpers lock, the brakes are locked, and the two cars skid forward 2.6m before stopping.the police officer, estimating the coefficient of kinetic friction between tires and road to be 0.80, calculates the speed of the sports car at impact. what was that speed?