Answer
Whether it is rising or falling, the acceleration of a freely falling projectile, in the absence of air resistance, is always $10 \frac{m}{s^{2}}$ directed downward.
Conceptual Physics (12th Edition)
by Hewitt, Paul G.
Published by
Addison-Wesley
ISBN 10:
0321909100
ISBN 13:
978-0-32190-910-7
Chapter 3 - Think and Explain - Page 55: 69
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