Fundamentals of Physics Extended (10th Edition)

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

Chapter 7 - Kinetic Energy and Work - Questions - Page 169: 3b

Answer

Negative work is being done.

Work Step by Step

The particle is initially traveling in the positive direction. Any force acting on the particle at an angle below 90$^{\circ}$ will pull the particle in the positive direction. A force acting above 90$^{\circ}$ will pull the particle in the negative direction, there force creating negative work.
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