Explanation
Impossible Situation : Constant velocity requires zero acceleration (Newton’s First Law). Variable acceleration would imply a changing net force , which must alter velocity (contradicting " constant velocity "). Possible Situations : Zero velocity, non-zero acceleration : Example: A ball at the top of its vertical toss (v=0, a=9.8 m/s² downward). Velocity east, acceleration west : Example: A car moving east while braking (deceleration acts west). Velocity east, acceleration east : Example: A car speeding up in the east direction.
