A Solid Wooden Door,90 Cm Wide by 2

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 mechanical energy is converted to internal energy during this collision?

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

Correct Answer:

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