25. A stone is thrown from the top of the building with an initial velocity of 20.0 m/s straight
upward. The building is 50.0
m high, and the stone just misses the edge of the roof on its
way down. Determine the time at which the stone reaches its maximum height
a. 2.0 s
b. 3.0 s
C. 4.0 s
d. 5.0 s
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