Current location - Information Consultation Platform - Information Technology Consulting - Xiao Ning practices multiple exposures (multiple exposures of the same negative). As shown in the figure, he used the exposure mode of every 1.

Xiao Ning practices multiple exposures (multiple exposures of the same negative). As shown in the figure, he used the exposure mode of every 1.

As can be seen from the figure, the photo length of the car is l photo =1.8cm = 0.018m, and the actual length is L car = 4.5m,

The ratio of the actual length to the photo length is l car l photo =4.5m0.0 18m=250,

As can be seen from the figure, the distance photo length of the car within t= 1s is s photo =6cm, so the actual distance of the car is s=250×s photo = 250× 6cm = 1500m.

Speed:

v = ST = 15m 1s = 15m/s。

So choose B.

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