A mass attached to a 73.8 cm long string starts from rest and is rotated 29.2 rev in 1 min before reaching a final angular speed. Determine the angular acceleration of the mass, assuming that it is constant. Answer in units of rad/s 2 .

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?