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April 16, 2014

Homework Help: Physic problem(2)...Please help

Posted by pyhsiclover on Tuesday, May 21, 2013 at 12:17pm.

A 15 kg, 1 m wide door which has frictionless hinges is closed but unlocked. A 400 g ball hits the exact middle of the door at a velocity of 35 m/s and bounces off elastically, thereby causing the door to slowly swing open. How long in seconds does it take for the door to fully open (rotate 90 degrees)?

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