A Solid Wood Door, 90

Multiple Choice

A solid wood door, 90.0 cm wide by 2.00 m tall has a mass of 35.0 kg. It is ajar and at rest. A ball with a mass of 500 g is thrown perpendicular to the door with a speed of 20.0 m/s and hits the door 60.0 cm from the hinged side. The ball rebounds with a speed of 16.0 m/s along the same line. What is the angular speed of the door after the collision?

A) 0.127 rad/s
B) 0.925 rad/s
C) 1.14 rad/s
D) 2.28 rad/s
E) 4.57 rad/s