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May 28, 2015

Homework Help: physics

Posted by alk on Sunday, August 24, 2008 at 6:51pm.

An elevator without a ceiling is ascending with a constant speed of 10m/s. A boy on the elevator shoots a ball directly upward, from a height of 2.0m above the elevator floor, just as the elevator floor is 28m above the ground. The initial speed of the ball with respect to the elevator is 20m/s.
a) How long does the ball take to return to the elevator floor?

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