A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 2.5 s. You may ignore air resistance, so the brick is in free fall. How tall, in meters, is the building? what is the magnitude of the brick's velocity just before it reaches the ground? Sketch a,-t, vy-t, and y-t graphs for the motion of the brick.

Physics for Scientists and Engineers: Foundations and Connections
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ISBN:9781133939146
Author:Katz, Debora M.
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Problem 18PQ: Acceleration a has the dimensions of length per time squared, speed v has the dimensions of length...
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Problem 2
A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 2.5 s.
You may ignore air resistance, so the brick is in free fall.
a) How tall, in meters, is the building?
b) what is the magnitude of the brick's velocity just before it reaches the ground?
c) Sketch a,-t, v,-t, and y-t graphs for the motion of the brick.
a) h = 30.6 m
b) v = 24.5 m/s
Transcribed Image Text:Problem 2 A brick is dropped (zero initial speed) from the roof of a building. The brick strikes the ground in 2.5 s. You may ignore air resistance, so the brick is in free fall. a) How tall, in meters, is the building? b) what is the magnitude of the brick's velocity just before it reaches the ground? c) Sketch a,-t, v,-t, and y-t graphs for the motion of the brick. a) h = 30.6 m b) v = 24.5 m/s
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