Answer to Question #95042 in Mechanics | Relativity for B Ranjith Kumar

Question

The car in this image is travelling at 120 km/h in a 100 km/h speed zone. The speed camera is positioned in 4 different locations. Match the speed recorded to the correct speed camera positions.

car with boxes at different positions to the right of the car. Box 1 is at 0 degrees, Box 2 is at 30 degrees, Box 3 is at 45 degrees, Box 4 is at 70 degrees. Each is labelled as Position A. Position B, Position C and Position D.
1. 120 km/h


Position A
Position B
Position C
Position D

2. 104 km/h


Position A
Position B
Position C
Position D

3. 41 km/h


Position A
Position B
Position C
Position D

Answer 1

$$120\cos{0\degree}=120\frac{km}{h}$$

$$120\cos{30\degree}=104\frac{km}{h}$$

$$120\cos{45\degree}=85\frac{km}{h}$$

$$120\cos{70\degree}=41\frac{km}{h}$$

Therefore:

1. 120 km/h

Position A

2. 104 km/h

Position B

3. 41 km/h

Position D