A. Oh, you know, at the highest point, the ball is like, "Hey, I've reached my peak!" So its velocity is, drumroll please, zero! It's taking a little break before it comes back down.
B. When the ball is back to where it started, it's like, "Whoa, what a journey! I'm finally home!" So its velocity is also 10 m/s, but in the opposite direction. It's a bittersweet reunion.
C. At the highest point, the ball has reached its pinnacle, but gravity is like, "I'm still gonna pull you down!" So the acceleration at the highest point is -9.8 m/s². Negative because gravity is pulling downwards, and 9.8 m/s² because, well, that's just how gravity rolls here on Earth.
D. Just before the ball hits the ground, gravity is like, "Prepare for the grand finale, my friend!" So the acceleration right before it hits the ground is still -9.8 m/s². It's like gravity's closing act.
E. After 1 second, the acceleration of the ball is still -9.8 m/s². Gravity doesn't take any breaks, my friend! It's always there, pulling things down, making sure we stay grounded. Just like that one friend who always brings us back to reality.