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.