.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 ^2and 2m/s^2 respectively. Minimumvalue of X to avoid collision is(1) 60 m(3) 80 m(2) 75 m(4) 90 m

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