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

To determine which of the given options represent the situation where an object starts at the origin at t=0, its displacement from the origin becomes zero at some time, but its velocity is not zero, we can analyze each scenario.

1) An object in a uniform circular motion around a circle passing through the origin: In this scenario, the object is continuously moving in a circle around the origin. While its displacement from the origin might become zero at certain points during its motion, its velocity is always changing, and hence, it will be zero at some point. This option does not satisfy the condition mentioned.

2) A tennis ball thrown toward a wall and returning to the ground: In this scenario, the tennis ball is thrown in a specific direction, hits the wall, and then returns to the ground. When the ball reaches the wall, its displacement from the origin becomes zero, but its velocity might still be non-zero. Thus, this option satisfies the given condition.

3) A projectile thrown at an angle of 45 degrees and returning to the ground: In this scenario, a projectile is launched at an angle of 45 degrees to the ground. As it follows a parabolic path, it will eventually return to the ground. When it reaches the ground, its displacement will be zero, but its velocity might still be non-zero. Therefore, this option satisfies the condition.

4) A ball thrown straight up and returning to the ground: In this scenario, the ball is thrown straight up into the air and then falls back to the ground. Similar to the previous situations, when the ball reaches the ground, its displacement will be zero, but its velocity might still be non-zero. Hence, this option also satisfies the condition.

In summary, options 2, 3, and 4 represent scenarios where an object starts at the origin at t=0, has a displacement of zero at some later time, but its velocity is not zero.