A Baseball Pitcher,loosening Up His Arm Before a Game,tosses a 0.15-Kg

Multiple Choice

A baseball pitcher,loosening up his arm before a game,tosses a 0.15-kg ball using only the rotation of his forearm,0.32 m in length,to accelerate the ball.If the ball starts at rest and is released with a speed of 12 m/s in a time of 0.40 s,what is the average angular acceleration of the arm and ball?

A) 0.067 rad/s²
B) 94 rad/s²
C) 15 rad/s²
D) 37 rad/s²