Freefall: Solving Questions with Initial Velocity of 20 m/s

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The discussion focuses on solving a physics problem involving a ball thrown upward with an initial velocity of 20 m/s. Key questions include determining the total time the ball is in the air and the time it takes to reach 15 m above the release point. Participants highlight the need for information on initial velocity, peak velocity, gravitational acceleration, and the symmetry of the ball's motion. Understanding that the time to ascend is equal to the time to descend is crucial for solving the problem. The conversation emphasizes the importance of applying kinematic equations to find the required answers.
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I don't know how to do this problem. I feel like I need more information.

A ball is thrown upward with an initial velocity of 20 m/s.

1. How long is the ball in the air?

2. How long after release is the ball 15 m above the release point?
 
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For #1:

What is the initial velocity?
What is the velocity when the ball reaches the top of its upward travel?
Waht is the acceleration due due gravity?
Is the time taken to reach the top of its upward travel equal to the time to return to earth?
 
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