One end of a uniform meter stick is placed against a vertical wall . the other end is held by a lightweight cord that makes an angle with the stick. the coefficient of static friction between the end of the meter stick and the wall is 0.40.

a. what is the maximum value the angle can have if the stick is to remain in equilibrium?

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?