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In a car race on straight road, car A takes a time t less than car B at the finish and passes finishing point with a speed 'v' more than that of car B. Both the cars start from rest and travel with constant acceleration a 1 and a 2 respectively. Then 'v' is equal to :

1. 1 2 a a t
2. 1 2 1 2 2a a a a + t
3. 1 2 a a 2 + t
4. 1 2 2a a t

Correct answer: 1 2 a a t

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