Two Balls Dropped: Same Time Impact?

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The discussion centers on a physics problem involving two balls: one thrown upward from a building and another dropped from the same height one second later. The key question is determining the initial speed of the first ball so that both balls hit the ground simultaneously. Clarification was sought regarding the timing of the throws, confirming that the first ball is thrown at time t = 0 and the second is dropped at t = 1 second. The problem involves applying the kinematic equation for motion under gravity, while ignoring air resistance. Understanding the timing is crucial for solving the problem accurately.
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Homework Statement



A ball is thrown straight up from the edge of the roof of a building. A second ball is dropped from the roof 1 second later. You may ignore air resistance

If the height of the building is 20m what must the nitial speed of the first ball be if both are to hit the ground at the same time?

Homework Equations



y=yo+vo*t+1/2*a*t^(2)

The Attempt at a Solution



I had a question about the wording. So does the first two sentences mean that the first ball is thrown and when it travels for one second the second ball is about to drop? Or the first ball is thrown for some time t that is unknown and then one second after some time t the second ball is about to drop?
Thanks!
 
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Toranc3 said:
I had a question about the wording. So does the first two sentences mean that the first ball is thrown and when it travels for one second the second ball is about to drop?
Yes. At time t = 0 the first ball is thrown. At time t = 1 the second ball is dropped.
Or the first ball is thrown for some time t that is unknown and then one second after some time t the second ball is about to drop?
No.
 
Thank you!
 
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