Question

Which of the following represent examples of the following situation: An object that starts at the origin at t=0 and at some time later its displacement from origin is zero but the velocity is not zero:
1)An object in a uniform circular motion around a circle passing through origin
2)A tennis ball thrown toward a wall and returning to the ground
3)A projectile thrown at an angle of 45 degrees and returning to the ground
4)A ball thrown straight up and returning to the ground

Answer 1

all of those are at the origin, so displacement is zero, and all have some velocity at the origin.