Traditional Culture Encyclopedia - Photography and portraiture - Someone's photographic works
Someone's photographic works
Look at the topic first.
The actual length of the window frame of 100cm in the photo is 4cm:
The ratio of photos to reality is 4: 100, which is 1:25.
The trajectory length of the stone in the photo is 1.6cm:
According to the proportion, so in 0.02s, the length of movement is1.6cm * 25 = 40cm = 0.4m. ..
Bring t=0.02 s=0.4m into s = vt+1/2gt20.4 = 0.02v+5 * 0.022.
Solve v= 19.9m/s and v=gt, so t =1.99s.
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