Answer:
The 20.6 m/s will be the speed of ball after 3 seconds.
Explanation:
Initial velocity of the ball = u = 50 m/s
Final velocity of the ball = v = ?
Acceleration due to gravity = a = 
( ball is thrown against the gravity)
(first equation of motion)


Answer:
A. On Earth's surface, directly above the initial rock slippage.
Explanation:
I took the test got the answer right.
Atlantic, Arctic, Pacific, Indian, and Southern Ocean, near Antarctica.