Two motor cars on the same line approach each other with velocities u1 and u2 respectively. When each is seen from the other, the distance between them is x. If f1 and f2 to be the maximum retardation of the two cars then a collision can be just avoided then at which condition collision can just be avoided?

(u 1 2 f 2 + u 2 2 f 1 ) = f 1 f 2 (x)

Two motor cars on the same line approach each other with velocities u1

1.	Two motor cars on the same line approach each other with velocities u₁ and u₂ respectively. When each is seen from the other, the distance between them is x. If f₁ and f₂ to be the maximum retardation of the two cars then a collision can be just avoided then at which condition collision can just be avoided?
A.	(u<sub>1</sub><sup>2</sup>f<sub>2</sub> u<sub>2</sub><sup>2</sup>f<sub>1</sub>) = 2f<sub>1</sub>f<sub>2</sub>(x)
B.	(u<sub>1</sub><sup>2</sup>f<sub>2</sub> + u<sub>2</sub><sup>2</sup>f<sub>1</sub>) = 2f<sub>1</sub>f<sub>2</sub>(x)
C.	(u<sub>1</sub><sup>2</sup>f<sub>2</sub> + u<sub>2</sub><sup>2</sup>f<sub>1</sub>) = f<sub>1</sub>f<sub>2</sub>(x)
D.	(u<sub>1</sub><sup>2</sup>f<sub>2</sub> u<sub>2</sub><sup>2</sup>f<sub>1</sub>) = f<sub>1</sub>f<sub>2</sub>(x)
Answer» C. (u<sub>1</sub><sup>2</sup>f<sub>2</sub> + u<sub>2</sub><sup>2</sup>f<sub>1</sub>) = f<sub>1</sub>f<sub>2</sub>(x)

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