Awind turbine is rotating counterclockwise at 0.626 rev/s and slows to a stop in 12.9 s. its blades are 17.9 m in length. what is the centripetal acceleration of the tip of the blades at t=0~\text{s}t=0 s?

In which situation is the acceleration of a car negative? question 5 options: a)the velocity of a car was 75 km/hr over 4 hours. b)the velocity of a car reduced from 50 km/hr over one minute. c)the velocity of a car increased from 40 km.h to 75 km/h over 15 minutes. d)the velocity of a car was 45 km/hr at 2: 00pm and at 4: 00pm its velocity was 85 km/ht.