Traditional Culture Encyclopedia - Photography and portraiture - A pebble fell freely from a certain height above the ground, and a photographer happened to capture its falling trajectory ab. The amateur used a ruler.
A pebble fell freely from a certain height above the ground, and a photographer happened to capture its falling trajectory ab. The amateur used a ruler.
As can be seen from the figure:
The length of AB is 2cm, which is 0.02? M, and the exposure time is 1 1000s.
Therefore, the average speed of AB. v = XT = 0.02 1 1000 = 20m/s。
AB = the speed of the midpoint. v=20？ M/s,
From v2=2gh, we can get the height from the midpoint of AB to the starting point H = 22g in V = 20. m
So the answer is: 0.02? 20? 20
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