a) consider a ball thrown vertically up... acc is const and downwards, but eventually the ball comes down (ie. vel reverses)
b) not necessarily. consider STRAIGHT LINE MOTION........ lets say along +ve x direction, velocity & acceleration are 10 in magnitude initially. now say that acceleration decreases from 10 to 2 constantly; in this time onterval too, velocity INCREASES in +ve x direction (as the acceleration even while and even after it reduces is still along +ve direction) so here, direction of change in acceleration is -ve x (as it decreases from 10 to 2) and direction of change in velocity is still on +ve x direction.
hope the 2nd one is clear... if not, read slowly 1ce again
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