Answer to Question #233268 in Physics for Larkin

Question #233268

1. Jim drops a stone from the top of a five-storey building (a) How far has it fallen after 2 seconds? (b) What is the final velocity of the stone after 2 seconds of fall? (c) if the stone reaches the ground after 3 seconds, how high is the building? It is worth at this point to make a simple sketch.


2. How should the difference in mass, z = x - y, be reported? (Note that the symbol z now denotes the difference instead of the sum of two measurements).


1
Expert's answer
2021-09-06T11:35:37-0400

1a: the stone covered


h=gt22=19.6 m.h=\frac{gt^2}{2}=19.6\text{ m}.

1b: the velocity is


v=gt=19.6 m/s.v=gt=19.6\text{ m/s}.

1c: The building is


H=gT22=44.1 mH=\frac{gT^2}{2}=44.1\text{ m}

high.

2. This difference should be reported with appropriate units. However, more context would help to answer this question in detail.


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