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  4. Two cars A and B are approaching each other head-on with speeds 20 m/s and 10 m/s respectively. When their separation is X then A and B start braking at 4 m/s2 and 2 m/s2 respectively. Minimum value of X to avoid collision is

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Q. Two cars A and B are approaching each other head-on with speeds 20 m/s and 10 m/s respectively. When their separation is X then A and B start braking at 4 $m/s^2$ and 2 $m/s^2$ respectively. Minimum value of X to avoid collision is

Solution:

Correct answer is (b) 75 m