A brick is released with no initial speed from the roof of a building and strike
ID: 2044294 • Letter: A
Question
A brick is released with no initial speed from the roof of a building and strikes the ground in 2.90s , encountering no appreciable air drag.
A)How tall, in meters, is the building?
B)How fast is the brick moving just before it reaches the ground?
At the instant the traffic light turns green, an automobile that has been waiting at an intersection starts ahead with a constant acceleration of 2.70m/s2 . At the same instant, a truck, traveling with a constant speed of 14.7m/s , overtakes and passes the automobile. A)How far beyond its starting point does the automobile overtake the truck?
B)How fast is the automobile traveling when it overtakes the truck?
Explanation / Answer
V=u+g*t
V=0+9.81*2.9
(b) V=28.449 m/s Final velocity befor reaching the ground
(a)
V^2-u^2=2*a*H
28.449
Height of the building H=41.25 M
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