Question: An elevator without a ceiling is ascending with a constant speed of 10 m/s. A boy on a elevator throws a ball directly upward, fro.

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

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