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: 22c

Answer

$t= 1s$

Work Step by Step

Given that $x=3t^2-2t^3$, we take the derivative to find: $v=\frac{dx}{dt}=6t-6t^2$ For maximum positive $x$ position, $v$ will be zero: $6t-6t^2=0$ $t-t^2=0$ $t(1-t)=0$ $t=0, 1$ We plug in these values into $x_{(t)}=3t^2-2t^3$ to find what the position of the particle is at these points: For $t=0s$ $x_{(0)}=3(0)^2-2(0)^3=0m$ for $t=1s$ $x_{(1)}=3(1)^2-2(1)^3=1m$ As $x_{(1)}>x_{(0)}$, so $x$ reaches its maximum value at time $t= 1s$
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