Physics Technology Update (4th Edition)

Published by Pearson
ISBN 10: 0-32190-308-0
ISBN 13: 978-0-32190-308-2

Chapter 5 - Newton's Laws of Motion - Problems and Conceptual Exercises - Page 144: 57

Answer

$F=18.3N$

Work Step by Step

We know that $a=\frac{v^2-v_{\circ}^2}{2\Delta x}$ We plug in the known values to obtain: $a=\frac{(0m/s)^2-(1.25m/s)^2}{2(2.2m)}$ $a=-0.355m/s^2$ Now $F=ma$ We plug in the known values to obtain: $F=(51.5Kg)(-0.355m/s^2)$ $\implies F=-18.3N$ The negative sign shows that the force is opposite to the direction of motion of the swimmer.
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