College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 2 - Kinematics: Description of Motion - Learning Path Questions and Exercises - Exercises - Page 63: 61

Answer

a). For free fall, $v=u+at=0-gt=-9.8t\, m/s$ , we consider downwards to be negative. Graph is as shown. b). For free fall, $S=ut+\frac{1}{2}at^{2}=0-0.5\times 9.8t^{2}=-4.9t^{2}$ So, $y=-4.9t^{2}$. Graph is as shown.

Work Step by Step

a). For free fall, $v=u+at=0-gt=-9.8t\, m/s$ , we consider downwards to be negative. Graph is as shown. b). For free fall, $S=ut+\frac{1}{2}at^{2}=0-0.5\times 9.8t^{2}=-4.9t^{2}$ So, $y=-4.9t^{2}$. Graph is as shown.
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