Answer:
A. horizontal velocity is constant at 25 m/s in every interval
B. downward velocity increases by 9.8 m/s each second, to 19.6 m/s, 29.4 m/s, 39.2 m/s, 49.0 m/s
Explanation:
A.
Since the ball is not rocket-powered, it has no acceleration in the horizontal direction. (We ignore slowing due to air friction.) The horizontal velocity remains constant at 25 m/s.
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B.
The vertical acceleration is given as 9.8 m/s² in the downward direction. That is, each second the ball is in motion, its velocity downward increases by 9.8 m/s. The table can be filled with ...
t = 2 s, v = -19.6 m/s
t = 3 s, v = -29.4 m/s
t = 4 s, v = -39.2 m/s
t = 5 s, v = -49.0 m/s
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The sign is negative because the direction is downward. Positive is up.