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Which of the following statement is correct?
(a) Stopping distance is directly proportional to deceleration \( a \) of the vehicle.
(b) If two objects \( A \) and \( B \) are moving with velocities \( v_{A} \) and \( v_{B} \) in one dimension, then relative velocity of object \( A \) with respect to object \( B \) is given by \( v_{A B}=v_{A}-v_{B} \).
(c) For constant acceleration, average velocity is \( \bar{v}=\frac{v-u}{2} \).
(d) For a body thrown vertically upwards, then acceleration due to gravity will be taken as positive.
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