The children on the basketball court do not stop playing while the artificial gravity aboard the starship is fluctuating. The height $h(t)$ of a thrown ball at time $t$ is given by the table. The ball reaches its highest point at $t=0.6$ seconds.

Compute the average velocity of the ball from t=0.4 seconds to t=0.8 seconds.
average velocity = (include units)

Compute the average speed of the ball from t=0.4 seconds to t=0.8 seconds.
average speed = (include units)