A ball is thrown straight up from the edge of
the roof of a building. A second ball is dropped
from the roof 1.00 s later. You may ignore air
resistance.
(a) If the height of the building is 20.0 m, what
must the initial speed of the first ball be if
both are to hit the ground at the same time?
On the same graph, sketch the position of
each ball as a function of time, measured
from when the first ball is thrown. Consider
the same situation, but now let the initial
speed v0 of the first ball be g

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그냥 이렇게 그려서 푸는데 a가 아니고 해주는게 이유좀 ㅠ

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