An archer practicing with an arrow bow shoots an arrow straight up two times. The first time the initial speed is vi and second time he increases the initial sped to 4v. How would you compare the maximum height in the second trial to that in the first trial?

Awind turbine is rotating counterclockwise at 0.5 rev/s and slows to a stop in 10 s. its blades are 20 m in length. (a) what is the angular acceleration of the turbine? (b) what is the centripetal acceleration of the tip of the blades at t=0s? (c) what is the magnitude and direction of the total linear acceleration of the tip of the blades at t=0s?