Traditional Culture Encyclopedia - Photography and portraiture - Huaian 3D photography
Huaian 3D photography
Let the thickness of each brick be d and 9d-3d=aT2① when moving up.
When moving down: 3d-d=a'T2②
Simultaneous ① ②: AA ′ = 31③
According to Newton's second law, when moving upwards: mg+f = ma4.
When moving downward: mg-f=ma'⑤
Simultaneous 34 ⑤: f =12 mg;
Therefore, choose: B.
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