A ball of mass $200 g$ is thrown horizontally with a speed of $20{\text{ }}m{\text{ }}{s^{ - 1}}$ against a vertical wall.

The ball is in contact with the wall for a time of $0.10 s$ before rebounding back along its original path with a speed of $10{\text{ }}m{\text{ }}{s^{ - 1}}$.

What is the average force exerted by the wall on the ball during the collision?