Fundamentals of Physics Extended (10th Edition)

Published by Wiley
ISBN 10: 1-11823-072-8
ISBN 13: 978-1-11823-072-5

Chapter 2 - Motion Along a Straight Line - Problems - Page 33: 16c


$t=-0.82$ s

Work Step by Step

To find t when $x(t)=0,$ we solve the $x(t)$ function and substitute $x(t)=0$ in the equation; $4.0-6.0t^{2}=0$ $4.0=6.0t^{2}$ $\displaystyle \frac{4.0}{6.0}=t^{2}$ $t=\sqrt{\frac{4.0}{6.0}}\approx\pm 0.82$ s So, the negative time at which x passes through the origin is $-0.82$ s.
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