A Solid Wooden Door, 90 Cm Wide by

A solid wooden door, 90 cm wide by 2.0 m tall, has a mass of 35 kg. It is open and at rest. A small 500-g ball is thrown perpendicular to the door with a speed of 20 m/s and hits the door 60 cm from the hinged side, causing it to begin turning. The ball rebounds along the same line with a speed of 16.0 m/s relative to the ground. How much energy is lost during this collision?

A) 4.8 J
B) 15 J
C) 13 J
D) 30 J
E) 16 J

Correct Answer:

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