An X-T Graph Is Drawn for a Ball Moving in One

Multiple Choice

An x-t graph is drawn for a ball moving in one direction.The graph starts at the origin and at t = 6 s the velocity of the ball is zero.We can be positive that at t = 6 s,

A) the slope of the curve is non-zero.
B) the acceleration is constant.
C) the ball has stopped.
D) none of the above answers is always correct.